adding README notes #250

	name: RST Linter

	on:
	push:
	pull_request:

	jobs:
	doctor-rst:
	name: DOCtor-RST
	runs-on: ubuntu-latest
	steps:
	- name: Checkout
	uses: actions/checkout@v3

	- name: Create cache dir
	run: mkdir .cache

	- name: Extract base branch name
	run: echo "##[set-output name=branch;]$(echo ${GITHUB_BASE_REF:=${GITHUB_REF##*/}})"
	id: extract_base_branch

	- name: Cache DOCtor-RST
	uses: actions/cache@v3
	with:
	path: .cache
	key: doctor-rst-${{ steps.extract_base_branch.outputs.branch }}

	- name: DOCtor-RST
	uses: docker://oskarstark/doctor-rst
	with:
	args: --short --error-format=github --cache-file=/github/workspace/.cache/doctor-rst.cache

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