Add a workflow for pypi upload

[MacOS]

Adds a workflow for pypi upload.

This pull request address issue #2 .

[noklam]

@MacOS Do I need to set any secret for the project?

[MacOS]

@noklam Yes, you need to set the PyPi API token. You can create one on PyPi, and then add it to the repo via Settings > Security > Actions > Repository secrets. There you find a New repository secret button. Make sure that the name of the secret is PYPI_API_TOKEN (see here in my pull request)

[noklam]

Thanks! I have added the secret and merged.