Updating CODEOWNERS for ACS Identity (Azure#20881)

Co-authored-by: Aigerim Beishenbekova <aigerimb@Aigerims-MacBook-Pro.local>

Author: AikoBB

.github/CODEOWNERS

@@ -41,6 +41,7 @@
 /sdk/communication/                                                  @acsdevx-msft
 /sdk/communication/azure-communication-phonenumbers/                 @RoyHerrod @danielav7 @whisper6284 @AlonsoMondal
 /sdk/communication/azure-communication-sms/                          @RoyHerrod @arifibrahim4
+/sdk/communication/azure-communication-identity/                     @Azure/acs-identity-sdk
 
 # PRLabel: %KeyVault
 /sdk/keyvault/                                                       @schaabs @chlowell @mccoyp @YalinLi0312