Add a pyproject.toml

[pfmoore]

As an indication of best practice, we should consider adding a pyproject.toml file.

[pradyunsg]

SGTM. I'll make a PR tonight positively.

[Nazime]

The pyproject.toml is still not in the sample, is it best practice to put it in a project?

[dmtucker]

is it best practice to put it in a project?

Yes