added: navigation_drawer example

navigation_drawer/lib/main.dart

@@ -0,0 +1,45 @@
+import 'package:flutter/material.dart';
+
+void main() {
+  runApp(new MaterialApp(home: new MyDrawerApp()));
+}
+
+class MyDrawerApp extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) {
+    ListView listView = new ListView(
+      children: <Widget>[
+        getPaddedFirstText("Nav Item 1"),
+        getPaddedText("Nav Item 2"),
+        getPaddedText("Nav Item 3"),
+        getPaddedText("Nav Item 4"),
+      ],
+    );
+    Drawer myDrawer = new Drawer(
+      child: listView,
+    );
+
+    return new Scaffold(
+      appBar: new AppBar(
+        title: new Text("Navigation Drawer Example"),
+      ),
+      body: new Container(
+          child: new Center(
+        child: new Text("Hello World!"),
+      )),
+      drawer: myDrawer,
+    );
+  }
+
+  Padding getPaddedFirstText(var data) {
+    return new Padding(
+        child: new Text(data),
+        padding: const EdgeInsets.only(
+            left: 15.0, right: 15.0, bottom: .0, top: 40.0));
+  }
+
+  Padding getPaddedText(var data) {
+    return new Padding(
+        child: new Text(data), padding: const EdgeInsets.all(15.0));
+  }
+}