modification to readme

Author: Gaurav SinghaRoy

README.md

@@ -30,6 +30,10 @@ Install bundle.
 ```sh
 bundle install
 ```
+Create locale for [Gritter](https://github.com/RobinBrouwer/gritter)
+```sh
+rails g gritter:locale
+```
 <br> 
 Now the setup is complete.