Add standard build metadata

[flying-sheep]

Projects should contain PEP 517 metadata.

If you want, you can move the metadata in setup.py into that file too, but no matter what, it needs to be there.

[ralhei]

Thanks for your engagement. But would you mind to provide a bit more background for this toml file and its entries - which problem does it solve for me (or you) that I'm currently not aware of? How would I reproduce it?

[flying-sheep]

It’s how you write a python package.

Almost all tools still have legacy fall-back code that just uses setup.py, but that’ll go away eventually.

Directly invoking python setup.py <command> is also deprecated, setuptools should tell you about that. I replaced that too. (python -m build is the standard-based tool to build sdists and wheels)