Add CONTRIBUTING.md

Author: rizkyyangpalsu

CONTRIBUTING.md

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+# Contributing
+
+When contributing to this repository, please first discuss the change you wish to make via issue, email, or any other method with the owners of this repository before making a change.
+
+Please note we have a code of conduct, please follow it in all your interactions with the project.
+
+## Pull Request Process
+- Fork it
+- Create your feature branch (Optional)
+- Commit your changes
+- Push your commit to fork repository
+- Create new pull request
+
+## Note
+If you have issue with CSS or Javascript please create new issue in stisla repository 
+https://github.com/stisla/stisla/issues