Update README.md

BasicSample/README.md

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 Android Data Binding Basic Sample
 =============================================
+Simple demo of the Data Binding library (layout variables/experessions, observability, binding adapters, integration with ViewModels, etc.).
 
+Introduction
+------------
 This sample showcases the following features of the
 [Data Binding library](https://developer.android.com/topic/libraries/data-binding/index.html):
 

TwoWaySample/README.md

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 Android Data Binding Advanced Sample
 =============================================
+More complex demo of the Data Binding library (two-way binding, alternatives, adapters, animations, converters, view models, testing, etc.).
 
+Introduction
+------------
 This sample showcases the following features
 of the [Data Binding library](https://developer.android.com/topic/libraries/data-binding/index.html)
 with an app that shows a workout timer.