Merge #174: chore: add CODEOWNERS file

91e02d8 chore: add `CODEOWNERS` file (Luis Schwab)

Pull request description:

  ### Description

  Updated CODEOWNERS file to cover all files in the repo and include both primary and secondary maintainers @oleonardolima and @luisschwab, 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:
  luisschwab:
    ACK 91e02d8

Tree-SHA512: 46e4fd833dc202ae6c099bffb27f103d74876e5e3e1aadcac104eb1e250e2d0127283a371cd71a014b2483e65c4d6902b15e919ba5b8a170b8f6aafeea487eea

Author: luisschwab

.github/CODEOWNERS

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