CONTRIBUTING: added initial CONTRIBUTING github page.

CONTRIBUTING.md

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+## Questions about OpenELEC?
+
+To get your questions answered, please ask in the OpenELEC [Forum] or on IRC: #openelec on freenode.net or [webchat] 
+
+Do not open an issue.
+
+## Issue Reports
+
+If you are at all unsure whether it's a bug in OpenELEC or a problem with something
+else, post in the OpenELEC [Forum] instead. If it turns out that it is a bug, an issue
+can always bee opend later.
+
+If you are sure that it's a bug in OpenELEC, open a new [issue] and try to
+answer the following questions:
+
+- What did you do?
+- What did you expect to happen?
+- What happened instead?
+
+Please also search for similar issues. It's possible somebody has encountered this already. 
+It is always good to provide the zip file found in the logfiles samba share.
+
+Make sure to specify which version of OpenELEC you are using.
+- OpenELEC version
+- OpenELEC build
+- OpenELEC arch
+
+Please don't paste log messages in the issue reports or issue comments use [sprunge.us](http://sprunge.us) instead
+
+Feature requests are great, but they usually end up lying around the issue
+tracker indefinitely. Sending a pull request is a much better way of getting a
+particular feature into OpenELEC.
+
+## Pull Requests
+
+- **Add tests!** Your patch won't be accepted if it doesn't have tests.
+
+- **Create topic branches**. Don't ask us to pull from your master branch.
+
+- **One pull request per feature**. If you want to do more than one thing, send
+  multiple pull requests.
+
+- **Send coherent history**. Make sure each individual commit in your pull
+  request is meaningful. If you had to make multiple intermediate commits while
+  developing, please squash them before sending them to us.
+
+[Forum]: http://openelec.tv/forum
+[issue]: https://github.com/OpenELEC/OpenELEC.tv/issues
+[webchat]: http://openelec.tv/support/chat