setup.cfg 関係ドキュメント
例:
Configuring setuptools using setup.cfg files
setup.cfg自体の例:
https://gist.github.com/althonos/6914b896789d3f2078d1e6237642c35c
キーワードまとめ:
keywords setuptools.setup() accepts
New and Changed setup() Keywords
https://setuptools.pypa.io/en/latest/userguide/keywords.html