CONTRIBUTE missing

For an open source project it would be beneficial if you lay out how people can contribute. I currently only found a small "contribute" section in the readme and readthedocs.

You should describe if you would accept code contributions (e.g. through pull requests) and if yes, what requirements need to be met (e.g. in terms of code style, testing, development requirements ...).

The usual place to put these stuff is in a CONTRIBUTING file in the root (similar to the LICENSE file). Github has a good explanation and links to some good examples