Added CONTRIBUTING.md.

Author: scottgonzalez

CONTRIBUTING.md

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+Welcome! Thanks for your interest in contributing to jQuery Pointer Events. You're **almost** in the right place. More information on how to contribute to this and all other jQuery Foundation projects is over at [contribute.jquery.org](http://contribute.jquery.org). You'll definitely want to take a look at the articles on contributing [code](http://contribute.jquery.org/code).
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+You may also want to take a look at our [commit & pull request guide](http://contribute.jquery.org/commits-and-pull-requests/) and [style guides](http://contribute.jquery.org/style-guide/) for instructions on how to maintain your fork and submit your code. Before we can merge any pull request, we'll also need you to sign our [contributor license agreement](http://contribute.jquery.org/cla).
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+You can find us on [IRC](http://irc.jquery.org), specifically in [#jqueryui-dev](irc://irc.freenode.net/#jqueryui-dev) should you have any questions. If you've never contributed to open source before, we've put together [a short guide with tips, tricks, and ideas on getting started](http://contribute.jquery.org/open-source/).