Assistance with getting simulation running

[GaneshArvapalli]

I recently found this resource while trying to make a ROS simulation in Gazebo. I am currently learning ROS and was interested in making a drone simulation using the hector quadrotor. However, the instructions for ROS Kinetic/Melodic are not as clear as they were for previous versions and I am unsure of how to get everything into Gazebo.

I currently have hector_gazebo, hector_models, and hector_teleop built. I couldn't build the full hector_quadrotor due to its dependence on Gazebo Math (deprecated since Gazebo 7 and I am using Gazebo 9).

If the README could be updated with a set of commands in order to launch the quadrotor in an empty world (or one of the included worlds), I would greatly appreciate it. Thank you for creating this resource!