Add reference to a dependent website. #6
Description
This issue is a followup on this issue.
The uw_lidar_standalone.launch file is in a different repository, in nps_uw_sensors_gazebo
That repository is not in the dave_sim.repos files.
Hence, for now it's recommended to add documentation asking users to check out the nps_uw_sensors_gazebo repo under the prerequisite section.