Add CONTRIBUTING

CONTRIBUTING.md

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+# Darkroom - Contributing
+
+Darkroom `***REMOVED***/darkroom/core` is an open-source project. 
+It is licensed using the [MIT License][1]. 
+We appreciate pull requests; here are our guidelines:
+
+1.  [File an issue][2] 
+    (if there isn't one already). If your patch
+    is going to be large it might be a good idea to get the
+    discussion started early.  We are happy to discuss it in a
+    new issue beforehand, and you can always email
+    <foss+tech@go-jek.com> about future work.
+
+2.  Please use [Effective Go Community Guidelines][3].
+
+3.  We ask that you squash all the commits together before
+    pushing and that your commit message references the bug.
+
+## Issue Reporting
+- Check that the issue has not already been reported.
+- Be clear, concise and precise in your description of the problem.
+- Open an issue with a descriptive title and a summary in grammatically correct,
+  complete sentences.
+- Include any relevant code to the issue summary.
+
+## Pull Requests
+- Please read this [how to GitHub][4] blog post.
+- Use a topic branch to easily amend a pull request later, if necessary.
+- Write [good commit messages][5].
+- Use the same coding conventions as the rest of the project.
+- Open a [pull request][6] that relates to *only* one subject with a clear title
+  and description in grammatically correct, complete sentences.
+
+Much Thanks! ❤❤❤
+
+GO-JEK Tech
+
+[1]: https://opensource.org/licenses/MIT
+[2]: https://github.com/gojektech/heimdall/issues
+[3]: https://golang.org/doc/effective_go.html
+[4]: http://gun.io/blog/how-to-github-fork-branch-and-pull-request
+[5]: http://tbaggery.com/2008/04/19/a-note-about-git-commit-messages.html
+[6]: https://help.github.com/articles/using-pull-requests