The kit FKS0001 has four leds, connect these leds using GPIO 32, 33, 25 and 26
write a class Led to control the leds through objects derived from this class.
   led_red    = Led(32)
   led_yellow = Led(33) etc
Switching leds on or off:
   led_red(1)				# led red on
   led_yellow(1)			# led yellow on
   led_red(0)				# led red off
   led_red.toggle()			# led red on again
Switching ALL leds off:
   Led.allOff() or led_red.allOff(), etc
Write a unit test to demonstrate proper working
