chore: add CODEOWNERS file for default review assignments

- Introduced a CODEOWNERS file to designate @mrdavidlaing as the default reviewer for all pull requests, ensuring that the right eyes are on the code before it hits the stage.

This commit aims to keep our review process as smooth as a well-timed punchline, making sure the right folks are in the loop.

Author: mrdavidlaing-mo

.github/CODEOWNERS

@@ -0,0 +1,4 @@
+# These owners will be the default owners for everything in
+# the repo. They will be requested for review when someone 
+# opens a pull request.
+*       @mrdavidlaing