Create CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing to Wagtail
+
+Thank you for considering to help Wagtail.
+
+We welcome all support, whether on bug reports, code, design, reviews, tests, 
+documentation, translations or just feature requests.
+
+## Using the issue tracker
+
+The [issue tracker](https://github.com/torchbox/wagtail/issues) is
+the preferred channel for [bug reports](#bugs), [features requests](#features)
+and [submitting pull requests](#pull-requests). Please don't use the issue tracker
+for support - use our [Wagtail support group](https://groups.google.com/forum/#!forum/wagtail).
+
+## New code
+
+Please review the 
+[coding guidelines](http://docs.wagtail.io/en/latest/contributing/developing.html#coding-guidelines). 
+You might like to start by checking issues with the 
+[Ready to develop](https://github.com/torchbox/wagtail/issues?q=is%3Aopen+is%3Aissue+label%3A%22Ready+to+develop%21%22) label.
+
+## Code reviews
+
+We welcome code reviews from everyone. There's always a list of pull requests tagged ['Needs review'](https://github.com/torchbox/wagtail/pulls?q=is%3Apr+is%3Aopen+label%3A%22Needs+review%22).
+
+## Translations
+
+Please submit any new or improved translations through [Transifex](https://www.transifex.com/projects/p/wagtail/).