Java CI with Gradle

docs: update compatibility matrix in README #310

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Run time

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Job	Run time
macOS with JDK 8	1h 48m 48s
macOS with JDK 11	2h 28m 13s
macOS with JDK 17	2h 2m 27s
Ubuntu with JDK 8	1h 23m 30s
Ubuntu with JDK 11	1h 56m 42s
Ubuntu with JDK 17	1h 54m 9s
Windows with JDK 8	1h 44m 18s
Windows with JDK 11	1h 59m 43s
Windows with JDK 17	2h 33m 33s
	17h 51m 23s