add contributing section #3

	# https://github.com/marketplace/actions/github-action-for-pylint
	# https://www.henryschmale.org/2021/01/21/pylint-github-actions.html
	# Note: pylint can be very strict, so args may need to be tweaked.
	name: Pylint

	on: [push]

	jobs:
	build:
	runs-on: ubuntu-latest
	strategy:
	matrix:
	python-version: ["3.11"]
	steps:
	- uses: actions/checkout@v3
	- name: Set up Python ${{ matrix.python-version }}
	uses: actions/setup-python@v3
	with:
	python-version: ${{ matrix.python-version }}
	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	python -m venv venv
	# https://stackoverflow.com/a/74669486
	# https://docs.github.com/en/actions/using-workflows/workflow-commands-for-github-actions#setting-an-environment-variable
	. venv/bin/activate
	echo PATH=$PATH >> $GITHUB_ENV
	pip install -U pip wheel setuptools
	pip install pylint
	pip install -r requirements.txt
	# https://github.com/pylint-dev/pylint/blob/59194ebfa600b91ec4d5cef49370b7132b0413a3/pylint/lint/base_options.py#L153
	pylint --fail-under=9 $(git ls-files '*.py')
	deactivate

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