Startup node/basic motion node

[joseluizmendonca]

When we flip the main switch on the rover, we should be able to at least move the robot with simple PS style joystick!

For that, we need a basic startup system, that will run on a raspi anytime the rover if fired up, giving us basic motion capabilities. This node is also later going to be reused as the basic motion driver for the rover.

• Get ROS working on a Raspi
• Set up CAN communication with the Odrives
• Get ROS Odrive node working/Create custom node
• Determine kinematics of the rover
• Testing in Gazebo (can also be done before the CAN communication is set up!)