Add a JSON input / output example + README #300

Job	Run time
musl	1m 35s
Integration Tests / Test archive plugin	2m 13s
Integration Tests / Test Examples/APIGateway on 6.0.1-amazonlinux2	1m 28s
Soundness / API breakage check	1m 39s
Integration Tests / Test Examples/BackgroundTasks on 6.0.1-amazonlinux2	1m 17s
Soundness / Documentation check	1m 28s
Integration Tests / Test Examples/HelloJSON on 6.0.1-amazonlinux2	1m 13s
Integration Tests / Test Examples/HelloWorld on 6.0.1-amazonlinux2	1m 13s
Soundness / Broken symlinks check	4s
Soundness / Format check	37s
Integration Tests / Test Examples/S3_AWSSDK on 6.0.1-amazonlinux2	3m 55s
Integration Tests / Test Examples/S3_Soto on 6.0.1-amazonlinux2	4m 36s
Soundness / License headers check	7s
Integration Tests / Test Examples/Streaming on 6.0.1-amazonlinux2	1m 14s
Soundness / Unacceptable language check	4s
Soundness / Python lint check	0s
Soundness / Shell check	0s
Soundness / YAML lint check	4s
Swift 6 Language Mode / Swift 6 language mode	1m 16s
Unit tests / Unit tests / Windows (6.0)	2s
Unit tests / Unit tests / Windows (nightly-6.0)	3s
Unit tests / Unit tests / Linux (5.9)	25s
Unit tests / Unit tests / Windows (nightly-main)	1s
Unit tests / Unit tests / Linux (5.10)	27s
Unit tests / Unit tests / Linux (6.0)	1m 29s
Unit tests / Unit tests / Linux (nightly-6.0)	1m 45s
Unit tests / Unit tests / Linux (nightly-main)	1m 43s
	29m 58s

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