Merge #13: chore: add CODEOWNERS file

41e57a6 chore: add `CODEOWNERS` file (Leonardo Lima)

Pull request description:

  ### Description

  Updated CODEOWNERS file to cover all files in the repo and include both primary and secondary maintainers @evanlinjin and @oleonardolima, as per https://github.com/bitcoindevkit#stable.

  ### Checklists

  #### All Submissions:

  * [ ] I've signed all my commits
  * [x] I followed the [contribution guidelines](https://github.com/bitcoindevkit/bdk/blob/master/CONTRIBUTING.md)
  * [x] I ran `just p` before pushing

ACKs for top commit:
  evanlinjin:
    ACK 41e57a6

Tree-SHA512: 56c93d9dc3a287255b9b9b5b247a3c53ef9460ed789bbc92b8261dc0b8c6a01e498c8d0f84ada63bef31d8c1b6035b7fc9dbcfdac488a8d7e38f4fbcb0e8544f

Author: evanlinjin

.github/CODEOWNERS

@@ -0,0 +1 @@
+* @evanlinjin @oleonardolima