Add: 增加firebase 的相关配置

lib/utils/analytics.dart

@@ -0,0 +1,7 @@
+import 'package:firebase_analytics/firebase_analytics.dart';
+import 'package:firebase_analytics/observer.dart';
+
+//统计
+FirebaseAnalytics analytics = FirebaseAnalytics();
+FirebaseAnalyticsObserver observer =
+    FirebaseAnalyticsObserver(analytics: analytics);

lib/utils/login.dart

@@ -0,0 +1,26 @@
+import 'package:firebase_auth/firebase_auth.dart';
+final GoogleSignIn _googleSignIn = GoogleSignIn();
+final FirebaseAuth _auth = FirebaseAuth.instance;
+
+Future<FirebaseUser> _handleSignIn() async {
+    final GoogleSignInAccount googleUser = await _googleSignIn.signIn();
+    final GoogleSignInAuthentication googleAuth = await googleUser.authentication;
+
+    final AuthCredential credential = GoogleAuthProvider.getCredential(
+        accessToken: googleAuth.accessToken,
+        idToken: googleAuth.idToken,
+    );
+
+    final FirebaseUser user = await _auth.signInWithCredential(credential);
+    print("signed in " + user.displayName);
+    return user;
+}
+
+_handleSignIn()
+    .then((FirebaseUser user) => print(user))
+    .catchError((e) => print(e));
+
+final FirebaseUser user = await _auth.createUserWithEmailAndPassword(
+    email: 'an email',
+    password: 'a password',
+);