Add CONTRIBUTING.md

CONTRIBUTING.md

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+# Have a question?
+
+Please ask in the [Users mailing list][mailing-lists] instead of opening a
+Github Issue. The Github issue tracker is strictly for bug reports.
+
+# Issues
+
+We use GitHub issues to track bugs. Please ensure your bug description is
+clear and has sufficient instructions to be able to reproduce the issue.
+
+If you face interoperability issues with your device, more often than not it's
+a device related issue. Please consult the [Users mailing list][mailing-lists]
+before submitting an Issue.
+
+# Pull Requests
+
+Pull requests are welcome. If you have a fix for a bug, go ahead and create a
+pull request. For other kinds of enhancements, please discuss in the [Users
+mailing list][mailing-lists] first.
+
+Please follow the guidelines [here][commit-guidelines] when committing your
+changes.
+
+## Contributor License Agreement
+
+By submitting a pull request to this repository, you acknowledge that, while
+maintaining copyright, you grant Zaid Abdulla a perpetual, worldwide, non-
+exclusive, no-charge, royalty-free, irrevocable license to reproduce, prepare
+derivative works of, publicly display, publicly perform, sublicense, and
+distribute your contributions and such derivative works under the AGPLv3
+license or any other license terms, including, but not limited to, proprietary
+or commercial license terms.
+
+You confirm that you own or have rights to distribute and sublicense the
+source code contained therein, and that your content does not infringe upon
+the intellectual property rights of a third party.
+
+[commit-guidelines]: http://tbaggery.com/2008/04/19/a-note-about-git-commit-messages.html
+[mailing-lists]: http://lists.genieacs.com