Provide a minimal code style guide for contributors

[ancaemcken]

A code style guideline would be helpful to both contributors and reviewers.

Hopefully, it would help avoid drowning reviewers in diffs caused by indentation issues and provide contributors the information needed to correctly set up their IDEs / linters correctly for various file types in the project.

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[workshub-stage]

This issue is now published on WorksHub. If you would like to work on this issue you can
start work on the WorksHub Issue Details page.