Update CODEOWNERS (#243)

* Update CODEOWNERS

* Update CODEOWNERS

Author: Yuangwang

CODEOWNERS

@@ -4,7 +4,8 @@
 
 # App Hosting Platform Adapters code
 # TODO add group for App Hosting
-/packages/@apphosting/adapter-*/ @Yuangwang @sjjj986 @jamesdaniels @tonyjhuang @blidd-google 
+/packages/@apphosting/adapter-*/ @Yuangwang @sjjj986 @jamesdaniels @tonyjhuang @blidd-google @taeold
+/packages/@apphosting/common/ @Yuangwang @sjjj986 @jamesdaniels @tonyjhuang @blidd-google @taeold
 
 # Web Frameworks code
 /packages/@apphosting/build/ @FirebaseExtended/firebase-full-time-employees @FirebaseExtended/monogram