add .editorconfig file #26

Job	Run time
Soundness / Unacceptable language check	3s
Soundness / Documentation check	1m 21s
Soundness / License headers check	6s
Soundness / Format check	38s
Soundness / API breakage check	0s
Soundness / Broken symlinks check	4s
Soundness / Python lint check	6s
Soundness / Shell check	33s
Soundness / YAML lint check	6s
Unit tests / Linux (5.9)	25s
Unit tests / Windows (6.0)	1s
Unit tests / Windows (nightly-6.0)	1s
Unit tests / Linux (5.10)	2m 5s
Unit tests / Windows (nightly-main)	2s
Unit tests / Linux (6.0)	2m 16s
Unit tests / Linux (nightly-6.0)	2m 38s
Unit tests / Linux (nightly-main)	2m 13s
	12m 38s

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