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+# CONTRIBUTING
+
+Contributions are welcome, and are accepted via pull requests. Please review these guidelines before submitting any pull requests.
+
+## Guidelines
+
+  * Please follow the [PSR-2](https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-2-coding-style-guide.md) Coding Standard, PHP-FIG Naming Conventions and the [PSR-4](https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-4-autoloader.md) autoloading standard
+  * Ensure that the current tests pass, and if you've added something new, add the tests where relevant.
+  * Remember that we follow SemVer. If you are changing the behaviour, or the public api, you may need to update the docs.
+  * Send a coherent commit history, making sure each individual commit in your pull request is meaningful. If you had to make multiple intermediate commits while developing, please squash them before submitting.
+  * You may also need to rebase to avoid merge conflicts.
+
+## Running Tests
+
+You will need an install of [Composer](https://getcomposer.org) before continuing.
+
+First, install the dependencies:
+
+```bash
+$ composer install
+```
+
+Then run phpunit:
+
+```bash
+$ vendor/bin/phpunit --coverage-text
+```
+
+If the test suite passes on your local machine you should be good to go.
+
+When you make a pull request, the tests will automatically be run again by [Travis CI](https://travis-ci.org/).