Add CONTRIBUTING md to repo so github will show "contribute" section …

…at top of pull request page

Enyo-DCO-1.0-Signed-Off-By: Ben Combee (ben.combee@palm.com)

CONTRIBUTING md

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+# Contributions
+
+Contributions are welcome for Enyo and its associated libraries including onyx and layout.
+
+Please see [Contributing to Enyo](http://enyojs.com/community/contribute/) for details
+on our contribution policy and guidelines for use of the Enyo-DCO-1.0-Signed-off-by
+line in your commits and pull requests.
+
+If you're interested in introducing new kinds, you might also consider hosting your own repo
+and contributing to the [Enyo community gallery](http://enyojs.com/gallery).