Separate CONTRIBUTING.md, see https://github.com/blog/1184-contributing-guidelines

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+Contributing
+============
+
+New contributions to the library are welcome, just a couple of guidelines:
+
+ * Tabs for indentation, not spaces please.
+ * Please ensure you're changing the individual files in /src, not the concatenated output in the Chart.js file in the root of the repo.
+ * Please check that your code will pass jshint code standards, gulp jshint will run this for you.
+ * Please keep pull requests concise, and document new functionality in the relevant .md file.
+ * Consider whether your changes are useful for all users, or if creating a Chart.js extension would be more appropriate.
+ * Please avoid committing in the build Chart.js & Chart.min.js file, as it causes conflicts when merging.