Added counts.csv file to record the number of people in each age group and cell #1754

	name: Coverage

	on:
	push:
	branches:
	- main
	pull_request:
	branches:
	- '**'

	jobs:

	build-and-test:
	name: coverage
	runs-on: ubuntu-latest

	steps:
	- uses: actions/checkout@v1

	- name: Set up Python 3.8
	uses: actions/setup-python@v1
	with:
	python-version: 3.8
	architecture: x64

	- name: install pyEpiabm
	run: \|
	python --version
	python -m pip install --upgrade pip setuptools wheel
	python -m pip install pyEpiabm/.
	python -m pip install coverage codecov
	- name: run coverage
	run: \|
	coverage run pyEpiabm/run_tests.py --unit
	- name: codecov
	if: success()
	env:
	CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
	run: \|
	codecov

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