Github: add CONTRIBUTING.md

CONTRIBUTING.md

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+##[Contributing](http://kivy.org/docs/contribute.html)
+
+There are many ways in which you can contribute to Kivy.
+Code patches are just one thing amongst others that you can submit to help the
+project. We also welcome feedback, bug reports, feature requests, documentation
+improvements, advertisement & advocating, testing, graphics contributions and
+many different things. Just talk to us if you want to help, and we will help you
+help us.
+
+#Feedback
+--------
+
+This is by far the easiest way to contribute something. If you're using
+Kivy for your own project, don't hesitate sharing. It doesn't have to be a
+high-class enterprise app, obviously. It's just incredibly motivating to
+know that people use the things you develop and what it enables them to
+do. If you have something that you would like to tell us, please don't
+hesitate. Screenshots and videos are also very welcome!
+We're also interested in the problems you had when getting started. Please
+feel encouraged to report any obstacles you encountered such as missing
+documentation, misleading directions or similar.
+We are perfectionists, so even if it's just a typo, let us know.
+
+#[Reporting an Issue](http://kivy.org/docs/contribute.html#reporting-an-issue)
+
+If you found anything wrong, a crash, segfault, missing documentation, invalid
+spelling, weird example, please take 2 minutes to report the issue. following
+the guide lines mentioned [here](http://kivy.org/docs/contribute.html#reporting-an-issue)
+
+##[Code Contributions](http://kivy.org/docs/contribute.html#code-contributions)
+
+Code contributions (patches, new features) are the most obvious way to help with
+the project's development. Since this is so common we ask you to follow our
+workflow to most efficiently work with us. Adhering to our workflow ensures that
+your contribution won't be forgotten or lost. Also, your name will always be
+associated with the change you made, which basically means eternal fame in our
+code history (you can opt-out if you don't want that).
+
+
+* [Coding style](http://kivy.org/docs/contribute.html#coding-style)
+* [Performances](http://kivy.org/docs/contribute.html#performances)
+* [Git & GitHub](http://kivy.org/docs/contribute.html#git-github)
+* [Code Workflow](http://kivy.org/docs/contribute.html#code-workflow)
+
+##[Documentation Contributions](http://kivy.org/docs/contribute.html#documentation-contributions)
+
+Documentation contributions generally follow the same workflow as code
+contributions, just a bit more lax. We don't ask you to go through all the
+hassle just to correct a single typo. For more complex contributions, please
+consider following the suggested workflow though.
+
+
+* #[Docstrings](http://kivy.org/docs/contribute.html#docstrings)
+
+
+#Unit tests contributions
+
+For testing team, we have the document `contribute-unittest` that
+explains how Kivy unit test are working and how you can create your own. Use the
+same approach as the `Code Workflow` to [submit new tests](http://kivy.org/docs/contribute.html#unit-tests-contributions).
+
+