added getter for locations

lib/service/controllers/location_controller.dart

@@ -12,6 +12,8 @@ class LocationController extends ChangeNotifier {
 
   final List<Location> _locations = [];
 
+  List<Location> get locations => _locations;
+
   Future<void> addLocation(Location location) {
     _locations.add(location);
     notifyListeners();