Add poe

[nat-n]

Further to discussion at #32

Resource description

Poe the Poet is a task runner that works well with poetry. You define tasks in the pyproject.toml like so:

[tool.poe.tasks]
test       = "pytest --cov=poethepoet"                                # simple command based task
mksandwich = { script = "my_package.sandwich:build" }                 # python script based task
tunnel     = { shell = "ssh -N -L 0.0.0.0:8080:$PROD:8080 $PROD &" }  # shell script based task

and then run them with the poe executable like so:

poe test

The task will be executed inside the poetry managed virtualenv, so no need to specify poetry run anywhere.

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