Adding github workflows to check and auto-publish code to pypi

[pmocz]

Adding some quality of life things to the repo:

Two Github actions:

1. check the code for style and common errors with ruff (test-package.yml)
2. Automatically publish new github release of the code to Pypi (publish-package.yml)

!!! Note, you will have to add PYPI_API_TOKEN to your github secrets for this repo, to be able to auto-publish

Also adding the relevant software license and badges to the readme