Adds a marker to the map.
The target object (Space, Door, or Coordinate) for the marker.
The HTML content for the Marker.
Optional
options: TAddMarkerOptionsOptional additional options for the Marker.
The created Marker, or undefined if creation failed.
// Add an interactive {@link Marker} to the map with custom HTML content.
map.Markers.add(coordinate, '<div>Marker Content</div>', { interactive: true });
Interface defining the controls and actions for markers (Marker) on the map.