Add CODEOWNERS

[aerorahul]

Description

This PR:

• adds a CODEOWNERS file to the repository. global-workflow is a collaborative space where contributions come from a variety of sources. This file will ensure that new development gets reviewed by the appropriate SME.

Type of change

• New feature (adds functionality)

Change characteristics

• Is this a breaking change (a change in existing functionality)? NO
• Does this change require a documentation update? NO
• Does this change require an update to any of the following submodules? NO
  • EMC verif-global
  • GDAS
  • GFS-utils
  • GSI
  • GSI-monitor
  • GSI-utils
  • UFS-utils
  • UFS-weather-model
  • wxflow

How has this been tested?

There is no code change associated with this PR

Checklist

• Any dependent changes have been merged and published
• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have documented my code, including function, input, and output descriptions
• My changes generate no new warnings
• New and existing tests pass with my changes
• This change is covered by an existing CI test or a new one has been added
• I have made corresponding changes to the system documentation if necessary

[KateFriedman-NOAA]

Looks good, thanks for adding this @aerorahul ! Left a few comments.

[KateFriedman-NOAA]

Looks good, thanks for putting this together @aerorahul !