Add a CODEOWNERS file

[Glittersup]

Summary

Review requests are not routed automatically, so every pull request waits to be noticed. Since the maintainer reviews everything here, encoding that makes the expectation visible and the routing automatic.

Acceptance criteria

• A CODEOWNERS file assigns ownership for the repository.
• The named owner has access to the repository.
• Review is requested automatically on new pull requests.

Getting started

Fork this repository, clone your fork, and add this repo as upstream:

git clone https://github.com/<your-username>/tricklepay-backend.git
cd tricklepay-backend
git remote add upstream https://github.com/TricklePay/tricklepay-backend.git

Create a branch for this issue:

git checkout -b chore/issue-171

Suggested commit message:

chore: add a CODEOWNERS file

Run npm run typecheck, npm test, and npm run build before opening a pull request and linking this issue.