add .editorconfig file #6

Job	Run time
Swift 6 Language Mode	0s
Soundness / Broken symlinks check	3s
Soundness / API breakage check	3m 31s
Soundness / Documentation check	2m 24s
Soundness / License headers check	4s
Soundness / Unacceptable language check	5s
Soundness / Format check	34s
Soundness / Python lint check	5s
Soundness / Shell check	37s
Soundness / YAML lint check	8s
Cxx interop / Cxx interop / Windows (6.0)	3s
Cxx interop / Cxx interop / Linux (5.9)	1m 58s
Cxx interop / Cxx interop / Windows (nightly-6.0)	2s
Cxx interop / Cxx interop / Linux (5.10)	2m 4s
Cxx interop / Cxx interop / Linux (6.0)	2m 8s
Cxx interop / Cxx interop / Windows (nightly-main)	1s
Cxx interop / Cxx interop / Linux (nightly-6.0)	2m 53s
Cxx interop / Cxx interop / Linux (nightly-main)	2m 58s
Unit tests / Unit tests / Linux (5.9)	4m 12s
Unit tests / Unit tests / Windows (6.0)	1s
Unit tests / Unit tests / Linux (5.10)	4m 9s
Unit tests / Unit tests / Windows (nightly-6.0)	3s
Unit tests / Unit tests / Linux (6.0)	4m 25s
Unit tests / Unit tests / Windows (nightly-main)	1s
Unit tests / Unit tests / Linux (nightly-6.0)	5m 8s
Unit tests / Unit tests / Linux (nightly-main)	5m 8s
	42m 45s

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