Update material-components-android-examples README

Update material-components-android-examples README.md

Author: yasmineevjen

README.md

@@ -1,2 +1,3 @@
 # material-components-android-examples
-Companion example apps and code for MDC-Android (http://github.com/material-components/material-components-android/).
+
+These example apps are Android implementations of hypothetical [Material Studies](https://material.io/design/material-studies/). Each one is built using the [MDC-Android library](http://github.com/material-components/material-components-android/) and features special customizations of color, typography, and shape made with [Material Theming](https://material.io/design/material-theming/).