Contributing guidelines

CONTRIBUTING.md

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+# Contributing
+
+Thank you for contributing to Relé! 
+
+To make the experience as easy as possible, we ask that you follow some simple 
+guidelines. Use your best judgment, and feel free to propose changes to this document 
+in a pull request. 
+
+Additionally, be sure that you read and follow our 
+[Code of Conduct](https://github.com/mercadona/rele/blob/master/CODE_OF_CONDUCT.md). 
+
+## Code
+
+We ask that you start a discussion before attempting to make a code contribution. For feature 
+requests, issues, bugs, etc. please 
+[create an issue via Github](https://github.com/mercadona/rele/issues/new) where we can all 
+discuss the contribution to the project. 
+
+It is always best to have community input before proposing changes that may later be rejected.
+
+### Pull Requests
+
+* Make sure any code changes are covered by tests by running `make test`.
+* Run `make lint` on any modified files.
+* If your branch is behind master, 
+[rebase](https://github.com/edx/edx-platform/wiki/How-to-Rebase-a-Pull-Request) on top of it.
+
+## Issues
+
+When you open an issue make sure you include the full stack trace and
+that you list all pertinent information (operating system, Python implementation, etc.) 
+as part of the issue description.
+
+Please include a minimal, reproducible test case with every bug
+report.