add contributor guidelines

GUIDELINES.md

@@ -0,0 +1,24 @@
+# Contributor Guidlines
+
+## Maintainers:
+Following are the users with write-access to this repository (maintainers) :
+* @bstriner
+* @farizrahman4u
+* @fchollet
+* @kemaswill
+* @lukedeo
+* @patyork
+* @tboquet
+* @the-moliver
+
+## Addition of new features
+* Addition of new features require submitting a pull request, even for those who have write access to this repository.
+* All incoming new features should be accompanied by documentation and unit tests.
+
+## Becoming a maintainer
+* To become a maintainer, you should be a recognized contributor to either Keras-contrib or Keras core.
+* If you think you are eligible to be a maintainer, you can contact one of the existing maintainers to join the team.
+
+## Versioning
+* Keras-contrib is tested only against the bleeding-edge version of Keras. 
+* In case the Travis build fails due to a change in Keras core, the maintainers are responsible of rectifying the issue.

README.md

@@ -20,3 +20,5 @@ Alternatively, using pip:
 ```shell
 sudo pip install git+https://www.github.com/farizrahman4u/keras-contrib.git
 ```
+
+For contributor guidelines see [GUIDELINES.md](GUIDELINES.md)