addPOIs 
  Adds multiple Points of Interest (POIs) to the manager.
Return
true if all POIs were successfully added, false otherwise (e.g., if any POI could not be added).
Parameters
pois
A Set of PointOfInterest to add.
Adds multiple Points of Interest (POIs) to the manager.
true if all POIs were successfully added, false otherwise (e.g., if any POI could not be added).
A Set of PointOfInterest to add.