Include screenshots in readme.

android/layout/custom_compound_view/readme.md

@@ -1,3 +1,5 @@
-This recipe shows how to extend an Android view and create a custom compound view
+This recipe shows how to extend an Android view and create a custom compound view.
 
-[See the recipe at developer.xamarin.com](http://developer.xamarin.com/recipes/android/layout/compound_view)
+![Screenshots of the app](./images/compoundview-03.png)
+
+[See the recipe at developer.xamarin.com](http://developer.xamarin.com/recipes/android/layout/compound_view/)