Allow a coach to give a "thumbs up" for Goals and Habits that clients accomplish

I love giving my clients a "thumbs up" for completing exercise sessions, weighing in, etc., but currently in the app I can't give my clients the same encouragement when they check off personal Habits or Goals they have completed (ones that coaches can add).

This seems like a really easy feature to add to the app that would offer a simple but powerful way for coaches to continually cheer on their clients.