add .editorconfig file #4

Job	Run time
Soundness / License headers check	3s
Soundness / Documentation check	1m 16s
Soundness / API breakage check	1m 8s
Soundness / Broken symlinks check	2s
Soundness / Unacceptable language check	7s
Soundness / Format check	31s
Soundness / Shell check	30s
Soundness / YAML lint check	7s
Soundness / Python lint check	4s
Cxx interop / Cxx interop / Linux (5.9)	52s
Cxx interop / Cxx interop / Windows (6.0)	4s
Cxx interop / Cxx interop / Linux (5.10)	57s
Cxx interop / Cxx interop / Linux (6.0)	1m 0s
Cxx interop / Cxx interop / Windows (nightly-6.0)	2s
Cxx interop / Cxx interop / Linux (nightly-6.0)	1m 5s
Cxx interop / Cxx interop / Windows (nightly-main)	2s
Cxx interop / Cxx interop / Linux (nightly-main)	1m 13s
Unit tests / Unit tests / Linux (5.9)	1m 18s
Unit tests / Unit tests / Windows (6.0)	1s
Unit tests / Unit tests / Windows (nightly-6.0)	1s
Unit tests / Unit tests / Linux (5.10)	1m 28s
Unit tests / Unit tests / Windows (nightly-main)	1s
Unit tests / Unit tests / Linux (6.0)	1m 33s
Unit tests / Unit tests / Linux (nightly-6.0)	1m 40s
Unit tests / Unit tests / Linux (nightly-main)	1m 51s
	16m 56s

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