Adding the CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing
+
+We want to make contributing to tumblr.php as easy and transparent as possible. If you run into problems, please open an issue. We also actively welcome pull requests.
+
+## Pull Requests
+
+1. Fork the repo and create your branch from `master`.
+2. If you've added code that should be tested, add tests.
+3. If you've changed APIs, update the documentation.
+4. Ensure the test suite passes.
+5. If you haven't already, complete the Contributor License Agreement ("CLA").
+
+## Contributor License Agreement ("CLA")
+
+In order to accept your pull request, we need you to submit a CLA.
+
+Complete your CLA [here](http://static.tumblr.com/zyubucd/GaTngbrpr/tumblr_corporate_contributor_license_agreement_v1__10-7-14.pdf) (a more integrated web form is coming soon).
+
+## License
+
+By contributing to tumblr.php you agree that your contributions will be licensed under its Apache 2.0 license.
+