Create the mecanum drivetrain

We have 4 sets of mecanum wheels that could be used with the Freenove robot kit. Design has to whip up some adapters so we can attach them to our gearboxes, but if you bring the software to life, you get a set of wheels. The design project is described briefly in: https://docs.google.com/document/d/1uuLvkiprWOmSIRJ5a0krY75xL-tG6-JNXKQO5vm4HaM/ which is on the google drive and entitled "Current Design Projects".

Could be fun, and not all that hard to do. (getting the axle adapter is probably a much harder part)

matthew