Move configuration of python version and project name into pyproject.toml

[mathijssh]

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Moved configuration of - Python version - Project folder - PyPi snapshot date

into the pyproject.toml configuration file. Leverages the possibility to create arbitrary configuration in the [tool] table (more info: https://packaging.python.org/en/latest/specifications/pyproject-toml/#arbitrary-tool-configuration-the-tool-table).

Also added a short README.md.

[mathijssh]

P.S. Apologies, I seem to have made a slight mistake by directly committing my changes to main (even though I forked the repo). Please let me know in case you would like me to close it and re-open with a PR from a feature branch.