SciPy pull request guidelines

Pull requests are always welcome, and the SciPy community appreciates any help you give. Note that a code of conduct applies to all spaces managed by the SciPy project, including issues and pull requests: https://docs.scipy.org/doc/scipy/dev/conduct/code_of_conduct.html

When submitting a pull request, we ask you to check the following:

1. Unit tests, documentation, and code style are in order. For details, please read https://docs.scipy.org/doc/scipy/dev/hacking.html

   It's also OK to submit work in progress if you're unsure of what this exactly means, in which case you'll likely be asked to make some further changes.

2. The contributed code will be licensed under SciPy's license, https://github.com/scipy/scipy/blob/main/LICENSE.txt. If you did not write the code yourself, you ensure the existing license is compatible and include the license information in the contributed files, or obtain permission from the original author to relicense the contributed code.