Add WearNotifications sample to sdk.atree am: f765bdac59 am: ae8eec3f19 am: c407cfe212 am: f48e6ce63a am: af4e7ac1f9 am: 55270a9ba5
am: a063b5a977

Change-Id: I3763577db915154d1111baf8df74470467d685b1