pybricks.robotics.DriveBase: Add basic example.

examples/pup/robotics/drivebase_basics.py

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+from pybricks.pupdevices import Motor
+from pybricks.parameters import Port, Direction
+from pybricks.robotics import DriveBase
+
+# Initialize both motors. In this example, the motor on the
+# left must turn counterclockwise to make the robot go forward.
+left_motor = Motor(Port.A, Direction.COUNTERCLOCKWISE)
+right_motor = Motor(Port.B)
+
+# Initialize the drive base. In this example, the wheel diameter is 56mm.
+# The distance between the two wheel-ground contact points is 112mm.
+drive_base = DriveBase(left_motor, right_motor, wheel_diameter=56, axle_track=112)
+
+# Drive forward by 500mm (half a meter).
+drive_base.straight(500)
+
+# Turn around clockwise (180 degrees)
+drive_base.turn(180)
+
+# Drive forward again to drive back.
+drive_base.straight(500)
+
+# Turn around counterclockwise.
+drive_base.turn(-180)