Create CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing
+
+You'd like to contribute? Great! Just a few things to be aware of.
+
+Please add tests for any additions. You'll need your own MailChimp account (free) and will need to modify the `mailchimp.config` that is created for you from the template when a build is completed. In this file, you'll add your api key and a list ID that is called `MasterListId`.
+
+Good luck and thanks for helping out! If you run into any problems, please submit an issue.