snippets/pup: add PFMotor examples

snippets/pup/motor_pf/motor_pf_basics.py

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+from pybricks.pupdevices import ColorDistanceSensor, PFMotor
+from pybricks.parameters import Port, Color
+from pybricks.tools import wait
+
+# Initialize the sensor.
+sensor = ColorDistanceSensor(Port.B)
+
+# Initialize a motor on channel 1, on the red output.
+motor = PFMotor(sensor, 1, Color.RED)
+
+# Rotate and then stop.
+motor.dc(100)
+wait(1000)
+motor.stop()
+wait(1000)
+
+# Rotate the other way at half speed, and then stop.
+motor.dc(-50)
+wait(1000)
+motor.stop()

snippets/pup/motor_pf/motor_pf_pwm.py

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+from pybricks.pupdevices import ColorDistanceSensor, PFMotor
+from pybricks.parameters import Port, Color, Direction
+from pybricks.tools import wait
+
+# Initialize the sensor.
+sensor = ColorDistanceSensor(Port.B)
+
+# You can use multiple motors on different channels.
+arm = PFMotor(sensor, 1, Color.BLUE)
+wheel = PFMotor(sensor, 4, Color.RED, Direction.COUNTERCLOCKWISE)
+
+# Accelerate both motors. Only these values are available.
+# Other values will be rounded down to the nearest match.
+for duty in [15, 30, 45, 60, 75, 90, 100]:
+    arm.dc(duty)
+    wheel.dc(duty)
+    wait(1000)
+
+# To make the signal more reliable, there is a short
+# pause between commands. So, they change speed and
+# stop at a slightly different time.
+
+# Brake both motors.
+arm.brake()
+wheel.brake()