Add verbose flag

Author: woensug-choi

launch/sonar_tank_seabat_f50_nps_multibeam.launch

@@ -1,7 +1,11 @@
 <?xml version="1.0"?>
 <launch>
+  
+  <arg name="verbose" default="false"/>
+  
   <include file="$(find gazebo_ros)/launch/empty_world.launch">
     <arg name="world_name" value="$(find nps_uw_multibeam_sonar)/worlds/sonar_tank_seabat_f50_nps_multibeam.world"/>
+    <arg name="verbose" value="$(arg verbose)"/>
   </include>
 
   <!-- Debugging visualizations -->