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+# Contribute to Doctrine
+
+Thank you for contributing to Doctrine!
+
+Before we can merge your Pull-Request here are some guidelines that you need to follow.
+These guidelines exist not to annoy you, but to keep the code base clean,
+unified and future proof.
+
+## Coding Standard
+
+We use the [Doctrine Coding Standard](https://github.com/doctrine/coding-standard).
+
+## Unit-Tests
+
+Please try to add a test for your pull-request.
+
+* If you want to contribute new functionality add unit- or functional tests
+  depending on the scope of the feature.
+
+You can run the unit-tests by calling ``vendor/bin/phpunit`` from the root of the project.
+It will run all the project tests.
+
+In order to do that, you will need a fresh copy of doctrine/collections, and you
+will have to run a composer installation in the project:
+
+```sh
+git clone git@github.com:doctrine/collections.git
+cd collections
+curl -sS https://getcomposer.org/installer | php --
+./composer.phar install
+```
+
+## Github Actions
+
+We automatically run your pull request through Github Actions against supported
+PHP versions. If you break the tests, we cannot merge your code, so please make
+sure that your code is working before opening up a Pull-Request.
+
+## Getting merged
+
+Please allow us time to review your pull requests. We will give our best to review
+everything as fast as possible, but cannot always live up to our own expectations.
+
+Thank you very much again for your contribution!