Create CONTRIBUTING.md

Author: anitagraser

CONTRIBUTING.md

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+# Contributing to MovingPandas
+
+Whether you are a novice or experienced software developer, all contributions
+and suggestions are welcome!
+
+## Getting Started
+
+If you are looking to contribute to the *MovingPandas* codebase, the best place to
+start is the [GitHub "issues" tab](https://github.com/anitagraser/movingpandas/issues).
+This is also a great place for filing bug reports and making suggestions for
+ways in which we can improve the code and documentation.
+
+## Contributing to the Codebase
+
+The code is hosted on [GitHub](https://github.com/anitagraser/movingpandas),
+so you will need to use [Git](http://git-scm.com/) to clone the project and make
+changes to the codebase. Once you have obtained a copy of the code, you should
+create a development environment that is separate from your existing Python
+environment so that you can make and test changes without compromising your
+own work environment.
+
+### Run the tests
+
+Before submitting your changes for review, make sure to check that your changes
+do not break any tests by running: ``pytest``
+
+### Raising Pull Requests
+
+Once your changes are ready to be submitted, make sure to push your changes to
+your fork of the GitHub repo before creating a pull request.  We will review
+your changes, and might ask you to make additional changes before it is finally
+ready to merge. However, once it's ready, we will merge it, and you will have
+successfully contributed to the codebase!