Add CONTRIBUTING.md

CONTRIBUTING.md

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+# Filing an issue
+
+If you want your issue to be resolved quickly, please include in your
+issue:
+
+* Gatsby version, node.js version, OS version
+* The contents of your `gatsby.config.js` and `package.json`.
+
+# Contributing
+You can install the latest `master` version of Gatsby by following these
+simple steps:
+
+* Clone the repo, navigate to its directory.
+* Execute `npm install` to install packages.
+* Execute `npm uninstall -g gatsby && npm link`
+* Use `git pull` to update to latest Gatsby.
+
+Test suite can be run via `npm test`.
+
+The usual contributing steps are:
+
+* Fork the [official repository](https://github.com/gatsbyjs/gatsby).
+* Clone your fork: git clone `git@github.com:<your-username>/gatsby.git`
+* Make sure tests are passing for you: npm install && npm test
+* Create a topic branch: git checkout -b topics/new-feature-name
+* Run `npm run watch` to watch code and compile your changes.
+* Add tests and code for your changes.
+* Once you‘re done, make sure all tests still pass: npm install && npm test
+* Commit and push to your fork.
+* Create an pull request from your branch.