Update README.md

Author: ankitshubham97

README.md

@@ -1,2 +1,14 @@
 # google-java-format-sublime
 A sublime plugin for formatting java code files with google-java-format
+
+## Platforms supported:
+Currently, it is only supported in OSX.
+
+## Sublime version supported:
+Currently, it is only supported in Sublime Text 2.
+
+## How to run:
+Command+Shift+g
+
+## Reference:
+https://github.com/google/google-java-format