add README to labs 1-3 and fix lab3 accelerators bandwidths #410

	name: Python test
	on: [push, pull_request]

	jobs:
	test:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4
	- name: Set up Python '3.11'
	uses: actions/setup-python@v4
	with:
	python-version: "3.11"
	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	# install the current zigzag-dse
	pip install .[dev]
	- name: Test with pytest
	run: \|
	pip install pytest
	python -m pytest tests/

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