Add CODEOWNERS file to define code reviewers

[BreakableHoodie]

What

This repo is missing a CODEOWNERS file. Without one, GitHub has no way to automatically request reviews from the right people when a pull request is opened.

Why now

CivicTechWR recently updated its branch protection and CODEOWNERS guidance. Each project repo manages its own review gates — the org-level .github CODEOWNERS does not propagate here.

How to fix

Create a CODEOWNERS file in the repo root:

# Primary reviewers
* @CivicTechWR/go-train-pass-project-team

# Keep organizers looped in on workflow and governance changes
/.github/workflows/** @CivicTechWR/go-train-pass-project-team @CivicTechWR/organizers
/docs/**              @CivicTechWR/go-train-pass-project-team @CivicTechWR/organizers

Then enable Require review from Code Owners in Settings → Branches → branch protection rule for main.

See the full guidance doc for details.