Add CONTRIBUTING.md

CONTRIBUTING.md

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+Description
+===========
+
+Your pull request description should include:
+
+* Summary of the changes made
+* Reasoning / motivation behind the change
+* What testing you have carried out to verify the change
+* If applicable, a link back to the bug report or forum discussion that prompted the change
+
+Other notes
+===========
+
+* Separate your work into multiple pull requests whenever possible. As a rule of thumb, each feature and each bugfix should go into a separate PR, unless they are closely related or dependent upon each other. Small pull requests are easier to review, and are less likely to require further changes before we can merge them. A "mega" pull request with lots of unrelated commits in it is likely to get held up in review for a long time.
+* Feel free to submit incomplete pull requests. Even if the work can not be merged yet, pull requests are a great place to collect early feedback. Just make sure to mark it as *[Incomplete]* or *[Do not merge yet]* in the title.
+* If you plan on contributing often, please read the [Developer Reference](https://wiki.openmw.org/index.php?title=Developer_Reference) on our wiki, especially the [Policies and Standards](https://wiki.openmw.org/index.php?title=Policies_and_Standards).