Move skywalking cluster to a dedicated module and reorganize the doc #82

	# Licensed to the Apache Software Foundation (ASF) under one or more
	# contributor license agreements. See the NOTICE file distributed with
	# this work for additional information regarding copyright ownership.
	# The ASF licenses this file to You 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
	#
	# 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
	# limitations under the License.

	name: License

	on:
	push:
	branches:
	- main
	pull_request:

	jobs:
	license:
	name: license
	runs-on: ubuntu-latest
	steps:
	- name: Checkout
	uses: actions/checkout@v2
	with:
	submodules: 'recursive'
	- name: Check License Header
	uses: apache/skywalking-eyes/header/@d299844e334855087f18ae1fe3c81ae8d22bc282
	with:
	config: .licenserc.yaml

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