Add a CONTRIBUTING.md file to Cladetime #201

	name: run-code-checks

	on:
	push:
	workflow_dispatch:

	jobs:
	run-checks:
	runs-on: ubuntu-latest
	steps:
	- name: Checkout 🛎️
	uses: actions/checkout@v4

	- name: Set up Python 🐍
	uses: actions/setup-python@v5
	with:
	cache: pip

	- name: Install dependencies 📦️
	run: \|
	pip install --upgrade pip
	pip install -r requirements/requirements-dev.txt
	pip install -e .

	- name: Lint 🧹
	run: ruff check

	- name: Run unit tests 🧪
	run: \|
	pytest -k unit

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