added: using_snackbar

using_snackbar/lib/main.dart

@@ -0,0 +1,19 @@
+import 'package:flutter/material.dart';
+
+void main() {
+  runApp(new MaterialApp(home: new ContactPage()));
+}
+
+class ContactPage extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) {
+    return new Scaffold(
+      appBar: new AppBar(
+        title: new Text("Using SnackBar"),
+      ),
+      body: new Center(
+        child: new Text("Hello World!"),
+      ),
+    );
+  }
+}