misc: Add CODEOWNER for automatically assigning the reviewers

[hydai]

Explanation

I would like to add the CODEOWNER file so the GitHub will automatically assign the reviewers for the docs PRs.

Related issue

None.

[juntao]

Hello, I am a PR summary agent on flows.network. Here are my reviews of code commits in this PR.

---

Commit 675d1c320b140c399d581e82e05b4370ea389969

• Key Changes:

1. Added .github/CODEOWNERS file: This new file specifies automatic code owners for pull request reviews.
2. Global Ownership Rule: All files (*) are set to be owned by @hydai, @juntao, and @alabulei1.

Important Finding:

• The introduction of a CODEOWNERS file will automatically assign the specified reviewers to all pull requests, streamlining the review process.