Updated README

README.md

@@ -1,3 +1,16 @@
 # ShellPlayground
 
-Xamarin.Forms Shell Playground
+**Xamarin.Forms** sample to show the main features of **shell** (4.0).
+
+The sample is available for two platforms:
+
+- iOS
+- Android
+
+## Screenshots
+
+<img src="images/shell-playground01.png" Width="210" /> <img src="images/shell-playground02.png" Width="210" /> <img src="images/shell-playground03.png" Width="210" /> <img src="images/shell-playground04.png" Width="210" />
+
+## Copyright and license
+
+Code released under the [MIT license](https://opensource.org/licenses/MIT).