Create initial version of the CONTRIBUTING.md file

CONTRIBUTING.md

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+Issues
+------
+
+If you've found a bug or have a great idea for a new feature that will help **all users** of impress.js, let us know by [adding your suggestion]
+(https://github.com/bartaz/impress.js/issues/new) to the [issue tracker](https://github.com/bartaz/impress.js/issues).
+
+Guidelines:
+
+* If reporting a bug, please provide a [simplified example](https://sscce.org/) on [Pastebin](https://pastebin.com/) or [JsFiddle](https://jsfiddle.net/).
+
+Pull Requests
+-------------
+
+If you have fixed a bug or implemented a feature that you'd like to share, send your [Pull Request](https://help.github.com/articles/using-pull-requests/) against the [master branch]
+(https://github.com/bartaz/impress.js/tree/master). But remember that the team will only accept code that fits the purpose of impress.js
+
+Guidelines:
+
+* Create a new [topic branch](https://github.com/dchelimsky/rspec/wiki/Topic-Branches) for every separate change you make.
+* Make sure impress.js runs successfully on as many browsers as you can test.