Add article (w/ robot data) on determining appropriate current limits

This is especially crucial for drives; non-current-limited drives tend to chew up carpets, wheels, and batteries for no good reason. You can avoid this by putting the robot up against a wall, linearly ramping the voltage, and recording the peak current reached (after the wheels slip the torque/current will drop slightly as the dynamic COF is lower than the static COF for pretty much all wheel materials).

Limiting motor current to a bit below the value required to slip the wheels should improve robot performance and decrease wear.