Add developer documentation #782

Job	Run time
Functional testing (GraalVM Dev Build) (17, ubuntu-20.04)	39m 40s
Set matrix	2m 8s
🧪 Maven: OfficialMetadataRepositoryFunctionalTest on ubuntu-20.04	8m 58s
🧪 Maven: OfficialMetadataRepositoryFunctionalTest on windows-latest	3m 52s
🧪 Maven: MetadataRepositoryFunctionalTest on ubuntu-20.04	6m 6s
🧪 Maven: MetadataRepositoryFunctionalTest on windows-latest	8m 40s
🧪 Maven: JavaAppWithTestsAndParentPomFunctionalTest on ubuntu-20.04	5m 14s
🧪 Maven: JavaAppWithTestsAndParentPomFunctionalTest on windows-latest	6m 36s
🧪 Maven: SBOMFunctionalTest on ubuntu-20.04	3m 7s
🧪 Maven: SBOMFunctionalTest on windows-latest	4m 17s
🧪 Maven: JavaApplicationFunctionalTest on ubuntu-20.04	7m 1s
🧪 Maven: JavaApplicationFunctionalTest on windows-latest	9m 44s
🧪 Maven: JavaApplicationWithTestsFunctionalTest on ubuntu-20.04	8m 49s
🧪 Maven: JavaApplicationWithTestsFunctionalTest on windows-latest	12m 3s
🧪 Maven: JavaApplicationWithAgentFunctionalTest on ubuntu-20.04	9m 9s
🧪 Maven: JavaApplicationWithAgentFunctionalTest on windows-latest	11m 47s
🧪 Maven: JavaApplicationWithResourcesFunctionalTest on ubuntu-20.04	8m 28s
🧪 Maven: JavaApplicationWithResourcesFunctionalTest on windows-latest	12m 7s
🧪 Maven: JavaLibraryFunctionalTest on ubuntu-20.04	3m 16s
🧪 Maven: JavaLibraryFunctionalTest on windows-latest	5m 6s
	2h 56m 8s

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