ROS: setup diff_bot

Thanks to repo https://ros-mobile-robots.com/ :

https://github.com/ros-mobile-robots/diffbot.git

Add vcstools:

sudo apt install python3-vcstool

Install Rosparam Shortcuts:

git clone https://github.com/PickNikRobotics/rosparam_shortcuts.git

rosrun teleop_twist_keyboard teleop_twist_keyboard.py --ros-args -r /cmd_vel:=/diffbot/mobile_base_controller/cmd_vel