Added maintenance mode section to README.md #1989

Job	Run time
Matrix Preparation	5s
Java 22, oracle, windows, America/New_York, tr_TR	4m 20s
Java 11, liberica, ubuntu, UTC, ru_RU	5m 7s
Java 17, zulu, macos, UTC, fr_FR, stress JIT	4m 25s
Java 21, corretto, ubuntu, UTC, tr_TR	3m 16s
Java 8, zulu, windows, America/New_York, ru_RU	4m 4s
	21m 17s

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