updated readme of each example with a screenshot/gif and more details about the example.

added more comments to code

handling_routes/lib/AboutPage.dart

@@ -4,28 +4,42 @@ class AboutPage extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     return new Scaffold(
+      // AppBar
       appBar: new AppBar(
+        // Title
         title: new Text("About Page"),
+        // App Bar background color
         backgroundColor: Colors.blue,
       ),
+      // Body
       body: new Container(
+        // Center the content
         child: new Center(
           child: new Column(
+            // Center content in the column
             mainAxisAlignment: MainAxisAlignment.center,
+            // add children to the column
             children: <Widget>[
+              // Text
               new Text(
                 "About Page\nClick on below icon to goto Home Page",
+                // Setting the style for the Text
                 style: new TextStyle(fontSize: 20.0),
+                // Set text alignment to center
+                textAlign: TextAlign.center,
               ),
+              // Icon Button
               new IconButton(
                 icon: new Icon(
                   Icons.home,
-                  color: Colors.blue,
+                  color: Colors.red,
                 ),
+                // Execute when pressed
                 onPressed: () {
                   // use the navigator to goto a named route
                   Navigator.of(context).pushNamed('/');
                 },
+                // Setting the size of icon
                 iconSize: 80.0,
               )
             ],