diff --git a/dropdown_button/.dart_tool/package_config.json b/dropdown_button/.dart_tool/package_config.json
new file mode 100644
index 0000000..964776e
--- /dev/null
+++ b/dropdown_button/.dart_tool/package_config.json
@@ -0,0 +1,182 @@
+{
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+      "packageUri": "lib/",
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+    },
+    {
+      "name": "dropdown_button",
+      "rootUri": "../",
+      "packageUri": "lib/",
+      "languageVersion": "2.7"
+    }
+  ],
+  "generated": "2020-01-18T13:42:39.526986Z",
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+}
diff --git a/enabling_splash_screen/.dart_tool/package_config.json b/enabling_splash_screen/.dart_tool/package_config.json
new file mode 100644
index 0000000..603e994
--- /dev/null
+++ b/enabling_splash_screen/.dart_tool/package_config.json
@@ -0,0 +1,182 @@
+{
+  "configVersion": 2,
+  "packages": [
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+      "name": "archive",
+      "rootUri": "file:///home/nishant/Documents/sdks/flutter/.pub-cache/hosted/pub.dartlang.org/archive-2.0.11",
+      "packageUri": "lib/",
+      "languageVersion": "2.0"
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+      "packageUri": "lib/",
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+    },
+    {
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+      "packageUri": "lib/",
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+    },
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+}
diff --git a/expense_planner/.dart_tool/package_config.json b/expense_planner/.dart_tool/package_config.json
new file mode 100644
index 0000000..c37c3c6
--- /dev/null
+++ b/expense_planner/.dart_tool/package_config.json
@@ -0,0 +1,188 @@
+{
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+    {
+      "name": "term_glyph",
+      "rootUri": "file:///home/nishant/Documents/sdks/flutter/.pub-cache/hosted/pub.dartlang.org/term_glyph-1.1.0",
+      "packageUri": "lib/",
+      "languageVersion": "1.8"
+    },
+    {
+      "name": "test_api",
+      "rootUri": "file:///home/nishant/Documents/sdks/flutter/.pub-cache/hosted/pub.dartlang.org/test_api-0.2.11",
+      "packageUri": "lib/",
+      "languageVersion": "2.2"
+    },
+    {
+      "name": "typed_data",
+      "rootUri": "file:///home/nishant/Documents/sdks/flutter/.pub-cache/hosted/pub.dartlang.org/typed_data-1.1.6",
+      "packageUri": "lib/",
+      "languageVersion": "2.0"
+    },
+    {
+      "name": "vector_math",
+      "rootUri": "file:///home/nishant/Documents/sdks/flutter/.pub-cache/hosted/pub.dartlang.org/vector_math-2.0.8",
+      "packageUri": "lib/",
+      "languageVersion": "2.0"
+    },
+    {
+      "name": "xml",
+      "rootUri": "file:///home/nishant/Documents/sdks/flutter/.pub-cache/hosted/pub.dartlang.org/xml-3.5.0",
+      "packageUri": "lib/",
+      "languageVersion": "2.3"
+    },
+    {
+      "name": "expense_planner",
+      "rootUri": "../",
+      "packageUri": "lib/",
+      "languageVersion": "2.1"
+    }
+  ],
+  "generated": "2020-01-18T13:42:46.124802Z",
+  "generator": "pub",
+  "generatorVersion": "2.7.0"
+}
diff --git a/expense_planner/ios/Flutter/Generated.xcconfig b/expense_planner/ios/Flutter/Generated.xcconfig
index f72c22e..e268dd4 100644
--- a/expense_planner/ios/Flutter/Generated.xcconfig
+++ b/expense_planner/ios/Flutter/Generated.xcconfig
@@ -1,9 +1,9 @@
 // This is a generated file; do not edit or check into version control.
-FLUTTER_ROOT=/opt/flutter_sdk/flutter_stable/flutter
-FLUTTER_APPLICATION_PATH=/home/sam0hack/LiveProjects/flutter_/expense_planner
+FLUTTER_ROOT=/home/nishant/Documents/sdks/flutter
+FLUTTER_APPLICATION_PATH=/home/nishant/Documents/workspaces/github_ws/flutter-examples/expense_planner
 FLUTTER_TARGET=lib/main.dart
 FLUTTER_BUILD_DIR=build
 SYMROOT=${SOURCE_ROOT}/../build/ios
-FLUTTER_FRAMEWORK_DIR=/opt/flutter_sdk/flutter_stable/flutter/bin/cache/artifacts/engine/ios
+FLUTTER_FRAMEWORK_DIR=/home/nishant/Documents/sdks/flutter/bin/cache/artifacts/engine/ios
 FLUTTER_BUILD_NAME=1.0.0
 FLUTTER_BUILD_NUMBER=1
diff --git a/expense_planner/ios/Runner/GeneratedPluginRegistrant.h b/expense_planner/ios/Runner/GeneratedPluginRegistrant.h
index 3b700eb..ed9a5c6 100644
--- a/expense_planner/ios/Runner/GeneratedPluginRegistrant.h
+++ b/expense_planner/ios/Runner/GeneratedPluginRegistrant.h
@@ -7,8 +7,11 @@
 
 #import <Flutter/Flutter.h>
 
+NS_ASSUME_NONNULL_BEGIN
+
 @interface GeneratedPluginRegistrant : NSObject
 + (void)registerWithRegistry:(NSObject<FlutterPluginRegistry>*)registry;
 @end
 
+NS_ASSUME_NONNULL_END
 #endif /* GeneratedPluginRegistrant_h */
diff --git a/google_signin/.dart_tool/package_config.json b/google_signin/.dart_tool/package_config.json
new file mode 100644
index 0000000..bf8b783
--- /dev/null
+++ b/google_signin/.dart_tool/package_config.json
@@ -0,0 +1,200 @@
+{
+  "configVersion": 2,
+  "packages": [
+    {
+      "name": "archive",
+      "rootUri": "file:///home/nishant/Documents/sdks/flutter/.pub-cache/hosted/pub.dartlang.org/archive-2.0.11",
+      "packageUri": "lib/",
+      "languageVersion": "2.0"
+    },
+    {
+      "name": "args",
+      "rootUri": "file:///home/nishant/Documents/sdks/flutter/.pub-cache/hosted/pub.dartlang.org/args-1.5.2",
+      "packageUri": "lib/",
+      "languageVersion": "2.0"
+    },
+    {
+      "name": "async",
+      "rootUri": "file:///home/nishant/Documents/sdks/flutter/.pub-cache/hosted/pub.dartlang.org/async-2.4.0",
+      "packageUri": "lib/",
+      "languageVersion": "2.0"
+    },
+    {
+      "name": "boolean_selector",
+      "rootUri": "file:///home/nishant/Documents/sdks/flutter/.pub-cache/hosted/pub.dartlang.org/boolean_selector-1.0.5",
+      "packageUri": "lib/",
+      "languageVersion": "2.0"
+    },
+    {
+      "name": "charcode",
+      "rootUri": "file:///home/nishant/Documents/sdks/flutter/.pub-cache/hosted/pub.dartlang.org/charcode-1.1.2",
+      "packageUri": "lib/",
+      "languageVersion": "1.0"
+    },
+    {
+      "name": "collection",
+      "rootUri": "file:///home/nishant/Documents/sdks/flutter/.pub-cache/hosted/pub.dartlang.org/collection-1.14.11",
+      "packageUri": "lib/",
+      "languageVersion": "2.0"
+    },
+    {
+      "name": "convert",
+      "rootUri": "file:///home/nishant/Documents/sdks/flutter/.pub-cache/hosted/pub.dartlang.org/convert-2.1.1",
+      "packageUri": "lib/",
+      "languageVersion": "1.17"
+    },
+    {
+      "name": "crypto",
+      "rootUri": "file:///home/nishant/Documents/sdks/flutter/.pub-cache/hosted/pub.dartlang.org/crypto-2.1.3",
+      "packageUri": "lib/",
+      "languageVersion": "2.1"
+    },
+    {
+      "name": "cupertino_icons",
+      "rootUri": "file:///home/nishant/Documents/sdks/flutter/.pub-cache/hosted/pub.dartlang.org/cupertino_icons-0.1.2",
+      "packageUri": "lib/",
+      "languageVersion": "2.0"
+    },
+    {
+      "name": "firebase_auth",
+      "rootUri": "file:///home/nishant/Documents/sdks/flutter/.pub-cache/hosted/pub.dartlang.org/firebase_auth-0.14.0+5",
+      "packageUri": "lib/",
+      "languageVersion": "2.0"
+    },
+    {
+      "name": "firebase_core",
+      "rootUri": "file:///home/nishant/Documents/sdks/flutter/.pub-cache/hosted/pub.dartlang.org/firebase_core-0.4.0+9",
+      "packageUri": "lib/",
+      "languageVersion": "2.0"
+    },
+    {
+      "name": "flutter",
+      "rootUri": "file:///home/nishant/Documents/sdks/flutter/packages/flutter",
+      "packageUri": "lib/",
+      "languageVersion": "2.2"
+    },
+    {
+      "name": "flutter_test",
+      "rootUri": "file:///home/nishant/Documents/sdks/flutter/packages/flutter_test",
+      "packageUri": "lib/",
+      "languageVersion": "2.2"
+    },
+    {
+      "name": "google_sign_in",
+      "rootUri": "file:///home/nishant/Documents/sdks/flutter/.pub-cache/hosted/pub.dartlang.org/google_sign_in-4.0.7",
+      "packageUri": "lib/",
+      "languageVersion": "2.0"
+    },
+    {
+      "name": "image",
+      "rootUri": "file:///home/nishant/Documents/sdks/flutter/.pub-cache/hosted/pub.dartlang.org/image-2.1.4",
+      "packageUri": "lib/",
+      "languageVersion": "2.0"
+    },
+    {
+      "name": "matcher",
+      "rootUri": "file:///home/nishant/Documents/sdks/flutter/.pub-cache/hosted/pub.dartlang.org/matcher-0.12.6",
+      "packageUri": "lib/",
+      "languageVersion": "2.2"
+    },
+    {
+      "name": "meta",
+      "rootUri": "file:///home/nishant/Documents/sdks/flutter/.pub-cache/hosted/pub.dartlang.org/meta-1.1.8",
+      "packageUri": "lib/",
+      "languageVersion": "1.12"
+    },
+    {
+      "name": "path",
+      "rootUri": "file:///home/nishant/Documents/sdks/flutter/.pub-cache/hosted/pub.dartlang.org/path-1.6.4",
+      "packageUri": "lib/",
+      "languageVersion": "2.0"
+    },
+    {
+      "name": "pedantic",
+      "rootUri": "file:///home/nishant/Documents/sdks/flutter/.pub-cache/hosted/pub.dartlang.org/pedantic-1.8.0+1",
+      "packageUri": "lib/",
+      "languageVersion": "2.1"
+    },
+    {
+      "name": "petitparser",
+      "rootUri": "file:///home/nishant/Documents/sdks/flutter/.pub-cache/hosted/pub.dartlang.org/petitparser-2.4.0",
+      "packageUri": "lib/",
+      "languageVersion": "2.4"
+    },
+    {
+      "name": "quiver",
+      "rootUri": "file:///home/nishant/Documents/sdks/flutter/.pub-cache/hosted/pub.dartlang.org/quiver-2.0.5",
+      "packageUri": "lib/",
+      "languageVersion": "2.0"
+    },
+    {
+      "name": "sky_engine",
+      "rootUri": "file:///home/nishant/Documents/sdks/flutter/bin/cache/pkg/sky_engine",
+      "packageUri": "lib/",
+      "languageVersion": "1.11"
+    },
+    {
+      "name": "source_span",
+      "rootUri": "file:///home/nishant/Documents/sdks/flutter/.pub-cache/hosted/pub.dartlang.org/source_span-1.5.5",
+      "packageUri": "lib/",
+      "languageVersion": "1.8"
+    },
+    {
+      "name": "stack_trace",
+      "rootUri": "file:///home/nishant/Documents/sdks/flutter/.pub-cache/hosted/pub.dartlang.org/stack_trace-1.9.3",
+      "packageUri": "lib/",
+      "languageVersion": "1.23"
+    },
+    {
+      "name": "stream_channel",
+      "rootUri": "file:///home/nishant/Documents/sdks/flutter/.pub-cache/hosted/pub.dartlang.org/stream_channel-2.0.0",
+      "packageUri": "lib/",
+      "languageVersion": "2.0"
+    },
+    {
+      "name": "string_scanner",
+      "rootUri": "file:///home/nishant/Documents/sdks/flutter/.pub-cache/hosted/pub.dartlang.org/string_scanner-1.0.5",
+      "packageUri": "lib/",
+      "languageVersion": "2.0"
+    },
+    {
+      "name": "term_glyph",
+      "rootUri": "file:///home/nishant/Documents/sdks/flutter/.pub-cache/hosted/pub.dartlang.org/term_glyph-1.1.0",
+      "packageUri": "lib/",
+      "languageVersion": "1.8"
+    },
+    {
+      "name": "test_api",
+      "rootUri": "file:///home/nishant/Documents/sdks/flutter/.pub-cache/hosted/pub.dartlang.org/test_api-0.2.11",
+      "packageUri": "lib/",
+      "languageVersion": "2.2"
+    },
+    {
+      "name": "typed_data",
+      "rootUri": "file:///home/nishant/Documents/sdks/flutter/.pub-cache/hosted/pub.dartlang.org/typed_data-1.1.6",
+      "packageUri": "lib/",
+      "languageVersion": "2.0"
+    },
+    {
+      "name": "vector_math",
+      "rootUri": "file:///home/nishant/Documents/sdks/flutter/.pub-cache/hosted/pub.dartlang.org/vector_math-2.0.8",
+      "packageUri": "lib/",
+      "languageVersion": "2.0"
+    },
+    {
+      "name": "xml",
+      "rootUri": "file:///home/nishant/Documents/sdks/flutter/.pub-cache/hosted/pub.dartlang.org/xml-3.5.0",
+      "packageUri": "lib/",
+      "languageVersion": "2.3"
+    },
+    {
+      "name": "google_signin",
+      "rootUri": "../",
+      "packageUri": "lib/",
+      "languageVersion": "2.7"
+    }
+  ],
+  "generated": "2020-01-18T13:42:49.233670Z",
+  "generator": "pub",
+  "generatorVersion": "2.7.0"
+}
diff --git a/google_signin/.flutter-plugins-dependencies b/google_signin/.flutter-plugins-dependencies
new file mode 100644
index 0000000..222d12c
--- /dev/null
+++ b/google_signin/.flutter-plugins-dependencies
@@ -0,0 +1 @@
+{"_info":"// This is a generated file; do not edit or check into version control.","dependencyGraph":[{"name":"firebase_auth","dependencies":["firebase_core"]},{"name":"firebase_core","dependencies":[]},{"name":"google_sign_in","dependencies":[]}]}
\ No newline at end of file
diff --git a/google_signin/lib/main.dart b/google_signin/lib/main.dart
index 5bc7307..03b4fff 100644
--- a/google_signin/lib/main.dart
+++ b/google_signin/lib/main.dart
@@ -42,12 +42,13 @@ class AppState extends State<App> {
     try {
       googleSignIn = GoogleSignIn();
       GoogleSignInAccount googleSignInAccount = await googleSignIn.signIn();
-      GoogleSignInAuthentication gauth =
-          await googleSignInAccount.authentication;
-      FirebaseUser user = await _auth.signInWithGoogle(
+      final GoogleSignInAuthentication gauth = await googleSignInAccount.authentication;
+      final AuthCredential credential = GoogleAuthProvider.getCredential(
         accessToken: gauth.accessToken,
         idToken: gauth.idToken,
       );
+      final AuthResult authRes = await _auth.signInWithCredential(credential);
+      final FirebaseUser user = authRes.user;
 
       setState(() {
         _username = user.displayName;
diff --git a/grid_layout/.dart_tool/package_config.json b/grid_layout/.dart_tool/package_config.json
new file mode 100644
index 0000000..77c5ff9
--- /dev/null
+++ b/grid_layout/.dart_tool/package_config.json
@@ -0,0 +1,182 @@
+{
+  "configVersion": 2,
+  "packages": [
+    {
+      "name": "archive",
+      "rootUri": "file:///home/nishant/Documents/sdks/flutter/.pub-cache/hosted/pub.dartlang.org/archive-2.0.11",
+      "packageUri": "lib/",
+      "languageVersion": "2.0"
+    },
+    {
+      "name": "args",
+      "rootUri": "file:///home/nishant/Documents/sdks/flutter/.pub-cache/hosted/pub.dartlang.org/args-1.5.2",
+      "packageUri": "lib/",
+      "languageVersion": "2.0"
+    },
+    {
+      "name": "async",
+      "rootUri": "file:///home/nishant/Documents/sdks/flutter/.pub-cache/hosted/pub.dartlang.org/async-2.4.0",
+      "packageUri": "lib/",
+      "languageVersion": "2.0"
+    },
+    {
+      "name": "boolean_selector",
+      "rootUri": "file:///home/nishant/Documents/sdks/flutter/.pub-cache/hosted/pub.dartlang.org/boolean_selector-1.0.5",
+      "packageUri": "lib/",
+      "languageVersion": "2.0"
+    },
+    {
+      "name": "charcode",
+      "rootUri": "file:///home/nishant/Documents/sdks/flutter/.pub-cache/hosted/pub.dartlang.org/charcode-1.1.2",
+      "packageUri": "lib/",
+      "languageVersion": "1.0"
+    },
+    {
+      "name": "collection",
+      "rootUri": "file:///home/nishant/Documents/sdks/flutter/.pub-cache/hosted/pub.dartlang.org/collection-1.14.11",
+      "packageUri": "lib/",
+      "languageVersion": "2.0"
+    },
+    {
+      "name": "convert",
+      "rootUri": "file:///home/nishant/Documents/sdks/flutter/.pub-cache/hosted/pub.dartlang.org/convert-2.1.1",
+      "packageUri": "lib/",
+      "languageVersion": "1.17"
+    },
+    {
+      "name": "crypto",
+      "rootUri": "file:///home/nishant/Documents/sdks/flutter/.pub-cache/hosted/pub.dartlang.org/crypto-2.1.3",
+      "packageUri": "lib/",
+      "languageVersion": "2.1"
+    },
+    {
+      "name": "cupertino_icons",
+      "rootUri": "file:///home/nishant/Documents/sdks/flutter/.pub-cache/hosted/pub.dartlang.org/cupertino_icons-0.1.2",
+      "packageUri": "lib/",
+      "languageVersion": "2.0"
+    },
+    {
+      "name": "flutter",
+      "rootUri": "file:///home/nishant/Documents/sdks/flutter/packages/flutter",
+      "packageUri": "lib/",
+      "languageVersion": "2.2"
+    },
+    {
+      "name": "flutter_test",
+      "rootUri": "file:///home/nishant/Documents/sdks/flutter/packages/flutter_test",
+      "packageUri": "lib/",
+      "languageVersion": "2.2"
+    },
+    {
+      "name": "image",
+      "rootUri": "file:///home/nishant/Documents/sdks/flutter/.pub-cache/hosted/pub.dartlang.org/image-2.1.4",
+      "packageUri": "lib/",
+      "languageVersion": "2.0"
+    },
+    {
+      "name": "matcher",
+      "rootUri": "file:///home/nishant/Documents/sdks/flutter/.pub-cache/hosted/pub.dartlang.org/matcher-0.12.6",
+      "packageUri": "lib/",
+      "languageVersion": "2.2"
+    },
+    {
+      "name": "meta",
+      "rootUri": "file:///home/nishant/Documents/sdks/flutter/.pub-cache/hosted/pub.dartlang.org/meta-1.1.8",
+      "packageUri": "lib/",
+      "languageVersion": "1.12"
+    },
+    {
+      "name": "path",
+      "rootUri": "file:///home/nishant/Documents/sdks/flutter/.pub-cache/hosted/pub.dartlang.org/path-1.6.4",
+      "packageUri": "lib/",
+      "languageVersion": "2.0"
+    },
+    {
+      "name": "pedantic",
+      "rootUri": "file:///home/nishant/Documents/sdks/flutter/.pub-cache/hosted/pub.dartlang.org/pedantic-1.8.0+1",
+      "packageUri": "lib/",
+      "languageVersion": "2.1"
+    },
+    {
+      "name": "petitparser",
+      "rootUri": "file:///home/nishant/Documents/sdks/flutter/.pub-cache/hosted/pub.dartlang.org/petitparser-2.4.0",
+      "packageUri": "lib/",
+      "languageVersion": "2.4"
+    },
+    {
+      "name": "quiver",
+      "rootUri": "file:///home/nishant/Documents/sdks/flutter/.pub-cache/hosted/pub.dartlang.org/quiver-2.0.5",
+      "packageUri": "lib/",
+      "languageVersion": "2.0"
+    },
+    {
+      "name": "sky_engine",
+      "rootUri": "file:///home/nishant/Documents/sdks/flutter/bin/cache/pkg/sky_engine",
+      "packageUri": "lib/",
+      "languageVersion": "1.11"
+    },
+    {
+      "name": "source_span",
+      "rootUri": "file:///home/nishant/Documents/sdks/flutter/.pub-cache/hosted/pub.dartlang.org/source_span-1.5.5",
+      "packageUri": "lib/",
+      "languageVersion": "1.8"
+    },
+    {
+      "name": "stack_trace",
+      "rootUri": "file:///home/nishant/Documents/sdks/flutter/.pub-cache/hosted/pub.dartlang.org/stack_trace-1.9.3",
+      "packageUri": "lib/",
+      "languageVersion": "1.23"
+    },
+    {
+      "name": "stream_channel",
+      "rootUri": "file:///home/nishant/Documents/sdks/flutter/.pub-cache/hosted/pub.dartlang.org/stream_channel-2.0.0",
+      "packageUri": "lib/",
+      "languageVersion": "2.0"
+    },
+    {
+      "name": "string_scanner",
+      "rootUri": "file:///home/nishant/Documents/sdks/flutter/.pub-cache/hosted/pub.dartlang.org/string_scanner-1.0.5",
+      "packageUri": "lib/",
+      "languageVersion": "2.0"
+    },
+    {
+      "name": "term_glyph",
+      "rootUri": "file:///home/nishant/Documents/sdks/flutter/.pub-cache/hosted/pub.dartlang.org/term_glyph-1.1.0",
+      "packageUri": "lib/",
+      "languageVersion": "1.8"
+    },
+    {
+      "name": "test_api",
+      "rootUri": "file:///home/nishant/Documents/sdks/flutter/.pub-cache/hosted/pub.dartlang.org/test_api-0.2.11",
+      "packageUri": "lib/",
+      "languageVersion": "2.2"
+    },
+    {
+      "name": "typed_data",
+      "rootUri": "file:///home/nishant/Documents/sdks/flutter/.pub-cache/hosted/pub.dartlang.org/typed_data-1.1.6",
+      "packageUri": "lib/",
+      "languageVersion": "2.0"
+    },
+    {
+      "name": "vector_math",
+      "rootUri": "file:///home/nishant/Documents/sdks/flutter/.pub-cache/hosted/pub.dartlang.org/vector_math-2.0.8",
+      "packageUri": "lib/",
+      "languageVersion": "2.0"
+    },
+    {
+      "name": "xml",
+      "rootUri": "file:///home/nishant/Documents/sdks/flutter/.pub-cache/hosted/pub.dartlang.org/xml-3.5.0",
+      "packageUri": "lib/",
+      "languageVersion": "2.3"
+    },
+    {
+      "name": "grid_layout",
+      "rootUri": "../",
+      "packageUri": "lib/",
+      "languageVersion": "2.7"
+    }
+  ],
+  "generated": "2020-01-18T13:42:52.676869Z",
+  "generator": "pub",
+  "generatorVersion": "2.7.0"
+}
diff --git a/handling_routes/.dart_tool/package_config.json b/handling_routes/.dart_tool/package_config.json
new file mode 100644
index 0000000..f9211dc
--- /dev/null
+++ b/handling_routes/.dart_tool/package_config.json
@@ -0,0 +1,176 @@
+{
+  "configVersion": 2,
+  "packages": [
+    {
+      "name": "archive",
+      "rootUri": "file:///home/nishant/Documents/sdks/flutter/.pub-cache/hosted/pub.dartlang.org/archive-2.0.11",
+      "packageUri": "lib/",
+      "languageVersion": "2.0"
+    },
+    {
+      "name": "args",
+      "rootUri": "file:///home/nishant/Documents/sdks/flutter/.pub-cache/hosted/pub.dartlang.org/args-1.5.2",
+      "packageUri": "lib/",
+      "languageVersion": "2.0"
+    },
+    {
+      "name": "async",
+      "rootUri": "file:///home/nishant/Documents/sdks/flutter/.pub-cache/hosted/pub.dartlang.org/async-2.4.0",
+      "packageUri": "lib/",
+      "languageVersion": "2.0"
+    },
+    {
+      "name": "boolean_selector",
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+}
diff --git a/image_from_network/.dart_tool/package_config.json b/image_from_network/.dart_tool/package_config.json
new file mode 100644
index 0000000..0ed8c86
--- /dev/null
+++ b/image_from_network/.dart_tool/package_config.json
@@ -0,0 +1,182 @@
+{
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+}
diff --git a/load_local_image/.dart_tool/package_config.json b/load_local_image/.dart_tool/package_config.json
new file mode 100644
index 0000000..6d34efc
--- /dev/null
+++ b/load_local_image/.dart_tool/package_config.json
@@ -0,0 +1,176 @@
+{
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+}
diff --git a/load_local_json/.dart_tool/package_config.json b/load_local_json/.dart_tool/package_config.json
new file mode 100644
index 0000000..a8a3f3d
--- /dev/null
+++ b/load_local_json/.dart_tool/package_config.json
@@ -0,0 +1,176 @@
+{
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+}
diff --git a/navigation_drawer/.dart_tool/package_config.json b/navigation_drawer/.dart_tool/package_config.json
new file mode 100644
index 0000000..f91fed0
--- /dev/null
+++ b/navigation_drawer/.dart_tool/package_config.json
@@ -0,0 +1,182 @@
+{
+  "configVersion": 2,
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+      "name": "archive",
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+      "packageUri": "lib/",
+      "languageVersion": "2.0"
+    },
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+      "packageUri": "lib/",
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+    },
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+      "packageUri": "lib/",
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+    },
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+    },
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+  "generated": "2020-01-18T13:43:12.953690Z",
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+}
diff --git a/persist_key_value/.flutter-plugins-dependencies b/persist_key_value/.flutter-plugins-dependencies
new file mode 100644
index 0000000..d597af0
--- /dev/null
+++ b/persist_key_value/.flutter-plugins-dependencies
@@ -0,0 +1 @@
+{"_info":"// This is a generated file; do not edit or check into version control.","dependencyGraph":[{"name":"shared_preferences","dependencies":[]}]}
\ No newline at end of file
diff --git a/simple_material_app/.dart_tool/package_config.json b/simple_material_app/.dart_tool/package_config.json
new file mode 100644
index 0000000..a563c5e
--- /dev/null
+++ b/simple_material_app/.dart_tool/package_config.json
@@ -0,0 +1,176 @@
+{
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+    },
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diff --git a/stateful_widget/.dart_tool/package_config.json b/stateful_widget/.dart_tool/package_config.json
new file mode 100644
index 0000000..cb1e1cf
--- /dev/null
+++ b/stateful_widget/.dart_tool/package_config.json
@@ -0,0 +1,176 @@
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diff --git a/stateless_widgets/.dart_tool/package_config.json b/stateless_widgets/.dart_tool/package_config.json
new file mode 100644
index 0000000..9046d86
--- /dev/null
+++ b/stateless_widgets/.dart_tool/package_config.json
@@ -0,0 +1,176 @@
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diff --git a/tip_calculator/.dart_tool/package_config.json b/tip_calculator/.dart_tool/package_config.json
new file mode 100644
index 0000000..2f2f667
--- /dev/null
+++ b/tip_calculator/.dart_tool/package_config.json
@@ -0,0 +1,176 @@
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diff --git a/using_alert_dialog/.dart_tool/package_config.json b/using_alert_dialog/.dart_tool/package_config.json
new file mode 100644
index 0000000..080319b
--- /dev/null
+++ b/using_alert_dialog/.dart_tool/package_config.json
@@ -0,0 +1,176 @@
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diff --git a/using_bottom_nav_bar/.dart_tool/package_config.json b/using_bottom_nav_bar/.dart_tool/package_config.json
new file mode 100644
index 0000000..b697be0
--- /dev/null
+++ b/using_bottom_nav_bar/.dart_tool/package_config.json
@@ -0,0 +1,176 @@
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diff --git a/using_custom_fonts/.dart_tool/package_config.json b/using_custom_fonts/.dart_tool/package_config.json
new file mode 100644
index 0000000..95bdc31
--- /dev/null
+++ b/using_custom_fonts/.dart_tool/package_config.json
@@ -0,0 +1,176 @@
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+    },
+    {
+      "name": "using_custom_fonts",
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+    }
+  ],
+  "generated": "2020-01-18T13:43:39.582614Z",
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+}
diff --git a/using_edittext/.dart_tool/package_config.json b/using_edittext/.dart_tool/package_config.json
new file mode 100644
index 0000000..f3cf312
--- /dev/null
+++ b/using_edittext/.dart_tool/package_config.json
@@ -0,0 +1,176 @@
+{
+  "configVersion": 2,
+  "packages": [
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+      "packageUri": "lib/",
+      "languageVersion": "2.0"
+    },
+    {
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+      "packageUri": "lib/",
+      "languageVersion": "2.0"
+    },
+    {
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+      "packageUri": "lib/",
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+    },
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+      "packageUri": "lib/",
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+    },
+    {
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+    }
+  ],
+  "generated": "2020-01-18T13:43:42.655151Z",
+  "generator": "pub",
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+}
diff --git a/using_firebase_db/.flutter-plugins-dependencies b/using_firebase_db/.flutter-plugins-dependencies
new file mode 100644
index 0000000..081e90b
--- /dev/null
+++ b/using_firebase_db/.flutter-plugins-dependencies
@@ -0,0 +1 @@
+{"_info":"// This is a generated file; do not edit or check into version control.","dependencyGraph":[{"name":"firebase_core","dependencies":[]},{"name":"firebase_database","dependencies":["firebase_core"]}]}
\ No newline at end of file
diff --git a/using_gradient/.dart_tool/package_config.json b/using_gradient/.dart_tool/package_config.json
new file mode 100644
index 0000000..7e51c3a
--- /dev/null
+++ b/using_gradient/.dart_tool/package_config.json
@@ -0,0 +1,176 @@
+{
+  "configVersion": 2,
+  "packages": [
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+      "packageUri": "lib/",
+      "languageVersion": "2.0"
+    },
+    {
+      "name": "args",
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+      "packageUri": "lib/",
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+    },
+    {
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+    },
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+      "packageUri": "lib/",
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+    },
+    {
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+    }
+  ],
+  "generated": "2020-01-18T13:43:49.185296Z",
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+}
diff --git a/using_http_get/.dart_tool/package_config.json b/using_http_get/.dart_tool/package_config.json
new file mode 100644
index 0000000..998afc2
--- /dev/null
+++ b/using_http_get/.dart_tool/package_config.json
@@ -0,0 +1,188 @@
+{
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+    },
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+    },
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+}
diff --git a/using_listview/.dart_tool/package_config.json b/using_listview/.dart_tool/package_config.json
new file mode 100644
index 0000000..c427f16
--- /dev/null
+++ b/using_listview/.dart_tool/package_config.json
@@ -0,0 +1,182 @@
+{
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+}
diff --git a/using_snackbar/.dart_tool/package_config.json b/using_snackbar/.dart_tool/package_config.json
new file mode 100644
index 0000000..fab818c
--- /dev/null
+++ b/using_snackbar/.dart_tool/package_config.json
@@ -0,0 +1,182 @@
+{
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+}
diff --git a/using_stepper/.dart_tool/package_config.json b/using_stepper/.dart_tool/package_config.json
new file mode 100644
index 0000000..ad9015c
--- /dev/null
+++ b/using_stepper/.dart_tool/package_config.json
@@ -0,0 +1,176 @@
+{
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+}
diff --git a/using_tabs/.dart_tool/package_config.json b/using_tabs/.dart_tool/package_config.json
new file mode 100644
index 0000000..86c4e29
--- /dev/null
+++ b/using_tabs/.dart_tool/package_config.json
@@ -0,0 +1,176 @@
+{
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+}
diff --git a/using_theme/.dart_tool/package_config.json b/using_theme/.dart_tool/package_config.json
new file mode 100644
index 0000000..bbc59b4
--- /dev/null
+++ b/using_theme/.dart_tool/package_config.json
@@ -0,0 +1,176 @@
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+}