TODO pip toml file pyproject.toml - to avoid --use-pep517

[clach04]

Future proof from:

(py311venv) C:\code\py\puren_tonbo>python -m pip install --upgrade git+https://github.com/clach04/chi_io.git
Collecting git+https://github.com/clach04/chi_io.git
  Cloning https://github.com/clach04/chi_io.git to c:\users\clach04\appdata\local\temp\pip-req-build-hh3fq4mi
  Running command git clone --filter=blob:none --quiet https://github.com/clach04/chi_io.git 'C:\Users\clach04\AppData\Local\Temp\pip-req-build-hh3fq4mi'
  Resolved https://github.com/clach04/chi_io.git to commit e680521b61b85d30b70bad19449fef5846cced15
  Preparing metadata (setup.py) ... done
Installing collected packages: chi-io
  DEPRECATION: chi-io is being installed using the legacy 'setup.py install' method, because it does not have a 'pyproject.toml' and the 'wheel' package is not installed. pip 23.1 will enforce this behaviour change. A possible replacement is to enable the '--use-pep517' option. Discussion can be found at https://github.com/pypa/pip/issues/8559
  Running setup.py install for chi-io ... done
Successfully installed chi-io-1.0.0

Also see #8