implemented using_tabs example

using_tabs/lib/FirstTab.dart

@@ -0,0 +1,22 @@
+import 'package:flutter/material.dart';
+
+class First extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) {
+    return new Container(
+      child: new Center(
+        child: new Column(
+          mainAxisAlignment: MainAxisAlignment.center,
+          children: <Widget>[
+            new Icon(
+              Icons.favorite,
+              size: 160.0,
+              color: Colors.red,
+            ),
+            new Text("First Tab")
+          ],
+        ),
+      ),
+    );
+  }
+}