docs: add CI workflow status badge to README #1

	name: CI
	on: [push]
	jobs:
	test:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4
	- name: Set up Python
	uses: actions/setup-python@v5
	with:
	python-version: '3.11'
	- name: Install dependencies
	run: pip install -r app/requirements.txt
	- name: Run health check
	run: \|
	python app/app.py &
	sleep 2
	curl -f http://localhost:5000/health

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