Add:创建 flutter go web 版

lib/widgets/themes/Material/MaterialButton/demo.dart

@@ -0,0 +1,50 @@
+/// @Author: 一凨 
+/// @Date: 2018-12-27 16:25:25 
+/// @Last Modified by:   一凨 
+/// @Last Modified time: 2018-12-27 16:25:25 
+
+import 'package:flutter_web/material.dart';
+
+class MaterialButtonDemo extends StatelessWidget {
+  final TextStyle txtStyle = TextStyle(color: Colors.white);
+
+  @override
+  Widget build(BuildContext context) {
+    return Container(
+      child: Column(
+        children: <Widget>[
+          MaterialButton(
+            onPressed: () {
+              print('click MaterialButton');
+            },
+            child: Text(
+              'MaterialButton',
+              style: txtStyle,
+            ),
+            color: Theme.of(context).primaryColor,
+          ),
+          FlatButton.icon(
+            icon: Icon(
+              Icons.bubble_chart,
+              color: Colors.white,
+            ),
+            label: Text(
+              'FlatButton',
+              style: txtStyle,
+            ),
+            onPressed: () {
+              print('click FlatButton');
+            },
+            color: Theme.of(context).primaryColor,
+          ),
+          RaisedButton(
+            onPressed: () {
+              print('click RaisedButton');
+            },
+            child: Text('RaisedButton'),
+          )
+        ],
+      ),
+    );
+  }
+}