add HelloJSON example + README #311

Job	Run time
musl	1m 33s
Integration Tests / Test Examples/APIGateway on 6.0.1-amazonlinux2	31s
Integration Tests / Test Examples/BackgroundTasks on 6.0.1-amazonlinux2	32s
Integration Tests / Test Examples/HelloJSON on 6.0.1-amazonlinux2	33s
Integration Tests / Test Examples/HelloWorld on 6.0.1-amazonlinux2	31s
Integration Tests / Test Examples/S3_AWSSDK on 6.0.1-amazonlinux2	32s
Integration Tests / Test Examples/S3_Soto on 6.0.1-amazonlinux2	30s
Integration Tests / Test Examples/Streaming on 6.0.1-amazonlinux2	32s
Integration Tests / Test archive plugin	2m 36s
Soundness / API breakage check	1m 41s
Soundness / Documentation check	1m 27s
Soundness / Unacceptable language check	2s
Soundness / License headers check	5s
Soundness / Broken symlinks check	3s
Soundness / Format check	41s
Soundness / Shell check	0s
Soundness / YAML lint check	6s
Soundness / Python lint check	0s
Swift 6 Language Mode / Swift 6 language mode	1m 7s
Unit tests / Unit tests / Linux (5.9)	24s
Unit tests / Unit tests / Linux (5.10)	24s
Unit tests / Unit tests / Linux (6.0)	1m 23s
Unit tests / Unit tests / Linux (nightly-6.0)	1m 47s
Unit tests / Unit tests / Linux (nightly-main)	1m 42s
Unit tests / Unit tests / Windows (6.0)	1s
Unit tests / Unit tests / Windows (nightly-6.0)	3s
Unit tests / Unit tests / Windows (nightly-main)	3s
	18m 49s

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