[asciidoctor-java] adding help in minimalistic main #306

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	name: Java CI with Maven

	on:
	push:
	branches: [ master ]
	pull_request:
	branches: [ master ]

	jobs:
	build:

	runs-on: ubuntu-20.04

	steps:
	- uses: actions/checkout@v2
	- name: Set up JDK 17
	uses: actions/setup-java@v1
	with:
	java-version: 17
	- name: Cache Maven packages
	uses: actions/cache@v2
	with:
	path: ~/.m2
	key: cache
	restore-keys: cache
	- name: Build with Maven
	run: mvn -B clean install
	- name: Remove Snapshots Before Caching
	run: find ~/.m2 -name '*SNAPSHOT' \| xargs rm -Rf

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