add .editorconfig file #52

Job	Run time
Swift 6 Language Mode	0s
Soundness / API breakage check	55s
Integration test / Windows (6.0)	3s
Integration test / Windows (nightly-6.0)	2s
Integration test / Linux (5.9)	1m 35s
Integration test / Windows (nightly-main)	1s
Soundness / Documentation check	1m 6s
Integration test / Linux (5.10)	1m 33s
Soundness / Broken symlinks check	3s
Integration test / Linux (6.0)	1m 54s
Soundness / Format check	33s
Integration test / Linux (nightly-6.0)	2m 36s
Soundness / Shell check	31s
Integration test / Linux (nightly-main)	32s
Soundness / Unacceptable language check	3s
Soundness / YAML lint check	3s
Soundness / License headers check	4s
Soundness / Python lint check	6s
Unit tests / Unit tests / Linux (5.9)	46s
Unit tests / Unit tests / Windows (6.0)	3s
Unit tests / Unit tests / Linux (5.10)	51s
Unit tests / Unit tests / Linux (6.0)	56s
Unit tests / Unit tests / Windows (nightly-6.0)	1s
Unit tests / Unit tests / Linux (nightly-6.0)	1m 9s
Unit tests / Unit tests / Windows (nightly-main)	2s
Unit tests / Unit tests / Linux (nightly-main)	30s
	15m 58s

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