Create CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing
+
+Thanks for contributing to Pedant! Just remember before you contribute, we ask that you follow Google's style guide for JavaScript.
+
+It's actually pretty easy: just before you run `git commit` just run `clang-format -i pedant.js` first, to make the code-style consistent.
+
+If you're running Ubuntu/Debian, you can install clang-format by `apt-get install clang-format`.
+
+If you're on a mac and have Homebrew installed, you can run `brew install clang-format` to get it.