Update CODEOWNERS
Use groups
-# Indy Common:
-* @anikitinDSR @ashcherbakov @skhoroshavin @Toktar @donqui
+# SPDX-License-Identifier: Apache-2.0
+
+# Indy Admin
+* @hyperledger/indy-admin
+
+# Indy Common
+* @hyperledger/indy-common
+
+# Indy Plenum Maintainers
+* @hyperledger/indy-plenum-maintainers
