Add Codecov badge to README #54

	name: CI
	on:
	push:
	branches: [ "**" ]
	pull_request:
	branches: [ "**" ]
	jobs:
	test:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4
	- uses: actions/setup-python@v5
	with:
	python-version: "3.11"
	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	python -m pip install -r kll_sketch/requirements-test.txt
	- name: Run tests with coverage
	run: python -m pytest --cov=kll_sketch --cov-report=term-missing --cov-report=xml kll_sketch/tests
	- name: Upload coverage reports to Codecov
	uses: codecov/codecov-action@v5
	with:
	token: ${{ secrets.CODECOV_TOKEN }}

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