Since the `./tools/devctr` Python project is a poetry project, it made
more sense to actually add instructions that encouraged the use of
poetry as opposed to plain ol' python virtual environments.
Also, since the poetry project is using an old version of python,
`3.10.*`, we added a `.python-version` file so that people could use
pyenv - which is the recommended tool to manage python versions by
poetry, see https://python-poetry.org/docs/managing-environments/

Signed-off-by: seafoodfry <99568361+seafoodfry@users.noreply.github.com>