add pyproject.toml

[ahms5]

We can adapt the pyproject.toml from cookiecutter, with the following exceptions:

• replace use_* option with a dependency option for copier, which could work like: numpy>1.2,scipy
• the _use_*, e.g. _use_pyfar parameters can be automatically generated by checking if e.g. pyfar is in dependency.
• remove use_black, because we dont use black
• use author parameter in pyproject.toml
• use _license_pypi_classifier as private variable in copier.yml