add Recipe for PyPI + GitHub Actions

[turbomam]

https://packaging.python.org/guides/publishing-package-distribution-releases-using-github-actions-ci-cd-workflows/

[nlharris]

@turbomam how about a PR with this addition in the appropriate place?

[turbomam]

I added a hyperlink in https://github.com/berkeleybop/berkeleybop.github.io/blob/master/best_practice.md

Is that too informal?

[nlharris]

that's fine. it's best practice to make changes via a PR but this one was simple enough that it's ok to just do a direct commit. thanks!