Add Swift package index yml file #232

Job	Run time
Test / Linux (5.8 - jammy)	2m 4s
Test / Windows (5.9 - windows-2022)	7m 21s
Test / Linux (5.9 - jammy)	2m 14s
Test / Windows (6.0 - windows-2022)	6m 34s
Test / Linux (5.10 - jammy)	2m 18s
Test / Windows (nightly - windows-2019)	11m 6s
Test / Linux (6.0 - jammy)	2m 32s
Test / Windows (nightly-6.0 - windows-2019)	9m 40s
Test / Linux (nightly-main - jammy)	4m 9s
Test / Linux (nightly-6.0 - jammy)	2m 56s
Soundness / API breakage check	3m 15s
Soundness / Documentation check	2m 26s
Soundness / Unacceptable language check	3s
Soundness / License headers check	0s
Soundness / Broken symlinks check	2s
Soundness / Format check	33s
Soundness / Shell check	31s
Soundness / YAML lint check	4s
Soundness / Python lint check	5s
	57m 53s

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