Document the ClearlyDefined certifier #293

	#
	# Copyright 2023 The GUAC Authors.
	#
	# Licensed under the Apache License, Version 2.0 (the "License");
	# you may not use this file except in compliance with the License.
	# You may obtain a copy of the License at
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	# http://www.apache.org/licenses/LICENSE-2.0
	#
	# Unless required by applicable law or agreed to in writing, software
	# distributed under the License is distributed on an "AS IS" BASIS,
	# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	# See the License for the specific language governing permissions and
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	name: ci

	on:
	push:
	branches:
	- main
	pull_request:
	branches:
	- main
	types:
	- opened
	- synchronize
	- reopened

	permissions:
	contents: read

	jobs:
	format:
	name: Format
	runs-on: ubuntu-latest
	steps:
	- name: Checkout code
	uses: actions/checkout@8e5e7e5ab8b370d6c329ec480221332ada57f0ab # tag=v3
	- name: Check markdown format
	run: npx --yes prettier --write --prose-wrap always *.md
	- name: Check that all markdown is up to date
	run: git status -s && test -z "$(git status -s)"

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