add contributing.md with notes on how to contribute to the eak website

Bluntly stolen from the ember.js CONTRIBUTING.md

Author: ghedamat

CONTRIBUTING.md

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+# Questions
+
+This is the issue tracker for Ember App Kit.
+The Ember App Kit community uses this site
+to collect and track bugs and discussions of new features.
+If you are having difficulties or have a question about usage please ask a
+question on StackOverflow: http://stackoverflow.com/questions/ask and tag
+your question with `ember-app-kit`.
+
+# Issues
+
+Think you've found a bug or have a new feature to suggest? Let us know!
+
+## Reporting a Bug
+1. Update to the most recent master release if possible. We may have already
+fixed your bug.
+
+2. Search for similar issues. It's possible somebody has encountered
+this bug already.
+
+3. Provide with a bug report that shows the problem.
+
+4. If possible, submit a Pull Request with a failing test. Better yet, take
+a stab at fixing the bug yourself if you can!
+
+The more information you provide, the easier it is for us to validate that
+there is a bug and the faster we'll be able to take action.
+
+# Pull Requests
+
+We love pull requests. Here's a quick guide:
+
+1. Fork the repo.
+
+2. Run the tests. We only take pull requests with passing tests
+
+3. Add a test for your change. Only refactoring and documentation changes
+require no new tests. If you are adding functionality or fixing a bug, we need
+a test!
+
+4. Make the test pass.
+
+5. Commit your changes. If your pull request fixes an issue specify it in the commit message.
+Here's an example: `git commit -m "Close #52 – Fix controller and viewbindings"`
+
+6. Push to your fork and submit a pull request. Please provide us with some
+explanation of why you made the changes you made. For new features make sure to
+explain a standard use case to us.
+
+We try to be quick about responding to tickets but sometimes we get a bit
+backlogged. If the response is slow, try to find someone on IRC (#emberjs) to
+give the ticket a review.
+
+# Website / Documentation
+
+The project documentations is available at http://iamstef.net/ember-app-kit/
+
+Ember App Kit is still under major development and contributions to the documentation are welcome!
+
+1. Fork the repo.
+
+2. Checkout the `gh-pages` branch
+
+3. Make your changes
+
+4. Commit and open a pull request against the `gh-pages` branch
+
+
+
+NOTE: Partially copied from https://raw.github.com/emberjs/ember.js/master/CONTRIBUTING.md
+