[Docs] Explain how to enable plugins in Xcode and Xcode Cloud #136

Job	Run time
Swift 6 Language Mode	0s
Compatibility test	4m 56s
Example packages / Linux (5.9)	8m 38s
Example packages / Linux (5.10)	8m 44s
Example packages / Linux (6.0)	8m 41s
Example packages / Linux (nightly-6.0)	8m 41s
Example packages / Linux (nightly-main)	28s
Integration test / Linux (5.9)	3m 20s
Integration test / Linux (5.10)	2m 26s
Integration test / Linux (6.0)	2m 33s
Integration test / Linux (nightly-6.0)	2m 41s
Soundness / API breakage check	0s
Integration test / Linux (nightly-main)	29s
Soundness / Documentation check	1m 45s
Soundness / Unacceptable language check	6s
Soundness / Broken symlinks check	3s
Soundness / Format check	2m 23s
Soundness / License headers check	5s
Soundness / Python lint check	6s
Soundness / Shell check	1m 25s
Soundness / YAML lint check	0s
Unit tests / Unit tests / Linux (5.9)	1m 44s
Unit tests / Unit tests / Linux (5.10)	1m 51s
Unit tests / Unit tests / Linux (6.0)	2m 31s
Unit tests / Unit tests / Linux (nightly-6.0)	2m 39s
Unit tests / Unit tests / Linux (nightly-main)	28s
	1h 6m 43s

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