[docs] Added java.md to developer docs #3437

Job	Run time
StaticAnalysis (17)	5m 12s
ValidateGradleWrapper	11s
Clients / UT & CodeCov (8)	17m 20s
Internal / UT & CodeCov (8)	5m 54s
Services / UT & CodeCov (8)	6m 45s
Clients / UT & CodeCov (11)	19m 3s
Clients / UT & CodeCov (17)	17m 55s
Internal / UT & CodeCov (11)	5m 52s
Services / UT & CodeCov (11)	6m 50s
Internal / UT & CodeCov (17)	6m 4s
Services / UT & CodeCov (17)	6m 50s
StaticAnalysisAndUnitTestsCompletionCheck	1s
	1h 37m 57s

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