Document releasing packages on PyPI

[hancush]

• CI setup (see OCD issue)
• Practices for creating PyPI project and ownership

[smcalilly]

this would be great. @hancush didn't we do this for a project recently? maybe we could use that process as the basis for this documentation?

[hancush]

Yes, we did that here: https://github.com/datamade/eds-api-client/pull/8