Add CODEOWNERS file

[cmalinmayor]

This affects who is required to review PRs. Current it's me for everything! Can be made more complex in the future.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.07%. Comparing base (1738545) to head (401887f).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #189   +/-   ##
=======================================
  Coverage   91.07%   91.07%           
=======================================
  Files          59       59           
  Lines        2923     2923           
=======================================
  Hits         2662     2662           
  Misses        261      261           

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