docs: add ci workflow status badge #4

	name: quality
	# https://docs.github.com/en/actions/reference/events-that-trigger-workflows#push
	on: [push]
	jobs:
	main:
	# https://github.com/actions/runner-images
	runs-on: ubuntu-latest
	timeout-minutes: 5
	steps:
	- uses: actions/checkout@v1

	# https://github.com/actions/cache/blob/main/examples.md#node---yarn
	- name: Get yarn cache directory path
	id: yarn-cache-dir-path
	run: echo "::set-output name=dir::$(yarn cache dir)"

	- name: Uncache Yarn dependencies
	uses: actions/cache@v2
	with:
	path: \|
	${{ steps.yarn-cache-dir-path.outputs.dir }}
	**/node_modules
	key: ${{ runner.os }}-yarn-${{ hashFiles('**/yarn.lock') }}
	restore-keys: \|
	${{ runner.os }}-yarn-

	- name: Install dependencies
	run: \|
	yarn install

	- name: Lint
	run: \|
	yarn lint:ci

	- name: Test
	run: \|
	yarn test:ci

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