Four Wheel Steering Robot Simulation Tutorial

This is a simulation of four wheel steering (4WS) robot. ROS : Melodic ros_controllers: https://github.com/ros-controls/ros_controllers four_wheel_steering_msgs: https://github.com/ros-drivers/four_wheel_steering_msgs urdf_geometry_parser: https://github.com/ros-controls/urdf_geometry_parser four_ws_robot project files https://drive.google.com/drive/folders/1HM7s0ufOMJomCIxRDVisIyoq0p60fRz-?usp=sharing