Add Wear project folder with OWNERS file. Also add folders for:

- Shared: common code shared between phone and wear app;
- Horologist: components provided from Horologist;

Change-Id: I70186deed0d2a941e1959613a65c69edfff70265

packages/CredentialManager/horologist/OWNERS

+include /core/java/android/credentials/OWNERS
+
+shuanghao@google.com
+gustavopagani@google.com

packages/CredentialManager/shared/OWNERS

+include /core/java/android/credentials/OWNERS
+
+shuanghao@google.com
+gustavopagani@google.com

packages/CredentialManager/wear/OWNERS

+include /core/java/android/credentials/OWNERS
+
+shuanghao@google.com
+gustavopagani@google.com