Introduce docc documentation and "supported features" #742

Job	Run time
Test (Java) (jammy swift:6.1.2 jdk:corretto)	2m 54s
Benchmark (JMH) (jammy swift:6.1.2 jdk:corretto)	7m 10s
Test (Java) (macos swift:6.1.2 jdk:corretto)	2m 40s
Sample JavaKitSampleApp (jammy swift:6.1.2 jdk:corretto)	4m 52s
Sample JavaDependencySampleApp (jammy swift:6.1.2 jdk:corretto)	6m 45s
Sample JavaProbablyPrime (jammy swift:6.1.2 jdk:corretto)	4m 47s
Test (Swift) (macos swift:6.1.2 jdk:corretto)	3m 32s
Test (Swift) (jammy swift:6.1.2 jdk:corretto)	6m 34s
Sample JavaSieve (jammy swift:6.1.2 jdk:corretto)	2m 0s
Sample SwiftKitSampleApp (jammy swift:6.1.2 jdk:corretto)	5m 33s
Sample JExtractJNISampleApp (jammy swift:6.1.2 jdk:corretto)	5m 28s
Sample SwiftAndJavaJarSampleLib (jammy swift:6.1.2 jdk:corretto)	4m 32s
Sample JavaDependencySampleApp (macos swift:6.1.2 jdk:corretto)	6m 0s
Sample JavaProbablyPrime (macos swift:6.1.2 jdk:corretto)	4m 20s
Sample JavaKitSampleApp (macos swift:6.1.2 jdk:corretto)	5m 4s
Sample SwiftAndJavaJarSampleLib (macos swift:6.1.2 jdk:corretto)	4m 50s
Sample JavaSieve (macos swift:6.1.2 jdk:corretto)	2m 51s
Sample SwiftKitSampleApp (macos swift:6.1.2 jdk:corretto)	5m 9s
Sample JExtractJNISampleApp (macos swift:6.1.2 jdk:corretto)	4m 53s
soundness / Documentation check	35s
soundness / Unacceptable language check	6s
soundness / Broken symlinks check	3s
soundness / Shell check	32s
soundness / License headers check	6s
soundness / YAML lint check	4s
soundness / Python lint check	6s
soundness / Format check	0s
soundness / API breakage check	0s
	1h 31m 26s

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