Add Favorites button to Users

[donna-roisen]

Is your feature request related to a problem? Please describe:
Today, I have to search for the users I work with regularly and cannot group or favorite them

Describe the solution you'd like:
I would like to be able to favorite the users that I work with regularly so I can quickly find them if needed

Describe alternatives you've considered:
not sure what else I would do

Additional context:
this would work ideally in the same way as favorites for rotations and schedules!