docs: describe the use of `composer create-project` for getting started #287

	# https://help.github.com/en/categories/automating-your-workflow-with-github-actions

	on:
	- pull_request
	- push

	name: CI

	jobs:

	tests:
	name: Tests on PHP ${{ matrix.php }}
	runs-on: ubuntu-latest
	strategy:
	fail-fast: false
	matrix:
	php: ['8.2']
	steps:
	- uses: actions/checkout@v2

	- uses: shivammathur/setup-php@v2
	with:
	php-version: ${{ matrix.php }}
	coverage: none
	tools: composer

	- name: Get composer cache directory
	id: composer-cache
	run: echo "::set-output name=dir::$(composer config cache-files-dir)"

	- name: Cache dependencies
	uses: actions/cache@v2
	with:
	path: ${{ steps.composer-cache.outputs.dir }}
	key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}
	restore-keys: ${{ runner.os }}-composer-

	- name: Install dependencies
	run: composer install --no-interaction --no-ansi --no-progress

	- name: Run tests
	run: vendor/bin/phpunit

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