Setup Nearby Interaction

How to use this

1. Once we created a userID in Firebase, @timmandz should call:

NearbyInteractionManager.shared.start(withUserID: <#userID here#>)

2. To present the interface, @sstuden should navigate to TagPlayerView() in full screen

Known Issues

1. Currently, the interface is just a simple list with information about the other devices, I'll work on supporting AR/direction indication next.
2. It has no actual tagging functionality, it will be worked on once we integrate with Firebase