Any .editorconfig was set to be ignored in cf92799.
This change introduces such a configuration file to allow contributors to use the correct code style more easily.

I'm not sure why the file was set to be ignored. IMHO it appears to be beneficial to place it in the repository to make it clear which indentation style is expected.

When I open the project in VS Code, it always attempts to indent using tabs, which is very frustrating. Obviously, I can just place my .editorconfig file from this PR into the project and resolve the issue for myself, but having the style defined right from the beginning for all developers would decrease onboarding friction.

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[ ] Bugfix
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[X] Code style update (formatting, local variables)
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