Update README.md

Author: auser

README.md

@@ -1,6 +1,11 @@
 ## react-native-oauth
 
-The `react-native-oauth` library provides an interface to OAuth 1.0 and OAuth 2.0 providers, such as [Twitter](http://twitter.com) and [Facebook](http://facebook.com) to React native.
+The `react-native-oauth` library provides an interface to OAuth 1.0 and OAuth 2.0 providers with support for the following providers for React Native apps:
+
+* Twitter
+* Facebook
+* Google
+* Github
 
 ## TL;DR;