add .editorconfig file #158

Job	Run time
Compatibility test	5m 34s
Swift 6 Language Mode	0s
Example packages / Windows (6.0)	1s
Example packages / Linux (5.9)	17m 18s
Example packages / Windows (nightly-6.0)	3s
Example packages / Linux (5.10)	15m 30s
Example packages / Windows (nightly-main)	3s
Integration test / Linux (5.9)	1m 39s
Example packages / Linux (6.0)	17m 9s
Integration test / Linux (5.10)	1m 40s
Example packages / Linux (nightly-6.0)	22m 21s
Example packages / Linux (nightly-main)	29s
Integration test / Linux (6.0)	1m 51s
Integration test / Windows (6.0)	3s
Integration test / Linux (nightly-6.0)	2m 9s
Integration test / Linux (nightly-main)	29s
Integration test / Windows (nightly-6.0)	1s
Integration test / Windows (nightly-main)	1s
Soundness / API breakage check	0s
Soundness / Broken symlinks check	4s
Soundness / Documentation check	1m 41s
Soundness / Format check	32s
Soundness / License headers check	2s
Soundness / Unacceptable language check	2s
Soundness / Python lint check	6s
Soundness / Shell check	33s
Soundness / YAML lint check	0s
Unit tests / Unit tests / Windows (6.0)	3s
Unit tests / Unit tests / Windows (nightly-6.0)	2s
Unit tests / Unit tests / Windows (nightly-main)	3s
Unit tests / Unit tests / Linux (5.9)	1m 31s
Unit tests / Unit tests / Linux (5.10)	1m 40s
Unit tests / Unit tests / Linux (6.0)	1m 39s
Unit tests / Unit tests / Linux (nightly-6.0)	2m 8s
Unit tests / Unit tests / Linux (nightly-main)	30s
	1h 36m 57s

Provide feedback