Initial contributing document

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+# Contributing to ejabberd
+
+We'd love for you to contribute to our source code and to make ejabberd even better than it is
+today! Here are the guidelines we'd like you to follow:
+
+* [Code of Conduct](#coc)
+* [Signing the CLA](#cla)
+
+## <a name="coc"></a> Code of Conduct
+
+Help us keep ejabberd community open-minded and inclusive. Please read and follow our [Code of Conduct][coc].
+
+## <a name="requests"></a> Questions, Bugs, Features
+
+### <a name="question"></a> Got a Question or Problem?
+
+Do not open issues for general support questions as we want to keep GitHub issues for bug reports
+and feature requests. You've got much better chances of getting your question answered on dedicated
+support platforms, the best being [Stack Overflow][stackoverflow].
+
+Stack Overflow is a much better place to ask questions since:
+
+- there are thousands of people willing to help on Stack Overflow
+- questions and answers stay available for public viewing so your question / answer might help
+  someone else
+- Stack Overflow's voting system assures that the best answers are prominently visible.
+
+To save your and our time, we will systematically close all issues that are requests for general
+support and redirect people to the section you are reading right now.
+
+Other channels for support are:
+- [ejabberd Mailing List][list]
+- [ejabberd XMPP room][muc]: ejabberd@conference.process-one.net
+
+## <a name="cla"></a> Signing the Contributor License Agreement (CLA)
+
+Upon submmitting a Pull Request, we will ask you to sign our CLA if you haven't done
+so before. It's a quick process, we promise, and you will be able to do it all online
+
+You can read [ProcessOne Contribution License Agreement][cla] in PDF.
+
+
+[coc]: https://github.com/processone/ejabberd/blob/master/CODE_OF_CONDUCT.md
+[stackoverflow]: https://stackoverflow.com/questions/tagged/ejabberd?sort=newest
+[list]: http://lists.jabber.ru/mailman/listinfo/ejabberd
+[muc]: xmpp:ejabberd@conference.process-one.net
+[cla]: https://www.process-one.net/resources/ejabberd-cla.pdf