code: public void addRoutes(@NonNull @Size(min = 1) List<DirectionsRoute> directionsRoutes) {
      routeLine.draw(directionsRoutes);
    }
docs: Provide a list of {@link DirectionsRoute}s, the primary route will default to the first route
  in the directions route list. All other routes in the list will be drawn on the map using the
  alternative route style.
  
  @param directionsRoutes a list of direction routes, first one being the primary and the rest of
  the routes are considered alternatives.
  @since 0.8.0