add .editorconfig file #14

Job	Run time
Soundness / API breakage check	37s
Soundness / Documentation check	1m 0s
Soundness / Format check	31s
Soundness / Broken symlinks check	3s
Soundness / License headers check	3s
Soundness / Unacceptable language check	3s
Soundness / Python lint check	5s
Soundness / Shell check	37s
Soundness / YAML lint check	8s
Cxx interop / Cxx interop / Linux (5.9)	38s
Cxx interop / Cxx interop / Linux (5.10)	39s
Cxx interop / Cxx interop / Linux (6.0)	46s
Cxx interop / Cxx interop / Windows (6.0)	1s
Cxx interop / Cxx interop / Linux (nightly-6.0)	51s
Cxx interop / Cxx interop / Linux (nightly-main)	53s
Cxx interop / Cxx interop / Windows (nightly-6.0)	1s
Unit tests / Unit tests / Linux (5.9)	41s
Cxx interop / Cxx interop / Windows (nightly-main)	1s
Unit tests / Unit tests / Linux (5.10)	40s
Unit tests / Unit tests / Linux (6.0)	44s
Unit tests / Unit tests / Windows (6.0)	6m 39s
Unit tests / Unit tests / Linux (nightly-6.0)	53s
Unit tests / Unit tests / Windows (nightly-6.0)	16m 37s
Unit tests / Unit tests / Linux (nightly-main)	56s
Unit tests / Unit tests / Windows (nightly-main)	17m 0s
	51m 7s

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