Add CODEOWNERS file
Add CODEOWNERS file

shikhar413/openmc,paulromano/openmc,liangjg/openmc,liangjg/openmc,amandalund/openmc,mit-crpg/openmc,paulromano/openmc,smharper/openmc,shikhar413/openmc,amandalund/openmc,smharper/openmc,mit-crpg/openmc,paulromano/openmc,smharper/openmc,paulromano/openmc,liangjg/openmc,shikhar413/openmc,shikhar413/openmc,amandalund/openmc,walshjon/openmc,smharper/openmc,walshjon/openmc,mit-crpg/openmc,walshjon/openmc,mit-crpg/openmc,liangjg/openmc,amandalund/openmc,walshjon/openmc