add .editorconfig file #75

Job	Run time
Integration test / Windows (nightly-6.0)	2s
Integration test / Windows (6.0)	1s
Integration test / Windows (nightly-main)	2s
Integration test / Linux (5.9)	1m 30s
Soundness / API breakage check	54s
Integration test / Linux (5.10)	1m 39s
Integration test / Linux (6.0)	1m 48s
Soundness / Broken symlinks check	3s
Integration test / Linux (nightly-6.0)	2m 6s
Soundness / Documentation check	1m 11s
Soundness / Format check	34s
Integration test / Linux (nightly-main)	29s
Soundness / License headers check	4s
Soundness / Python lint check	4s
Soundness / Unacceptable language check	3s
Soundness / Shell check	32s
Soundness / YAML lint check	3s
Unit tests / Unit tests / Linux (5.9)	47s
Unit tests / Unit tests / Linux (5.10)	46s
Unit tests / Unit tests / Windows (6.0)	3s
Unit tests / Unit tests / Linux (6.0)	59s
Unit tests / Unit tests / Linux (nightly-6.0)	1m 1s
Unit tests / Unit tests / Linux (nightly-main)	29s
Unit tests / Unit tests / Windows (nightly-6.0)	2s
Unit tests / Unit tests / Windows (nightly-main)	1s
	15m 13s

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