Random value library for arduino-copilot.

Here's an example that flashes the LED randomly.

 main :: IO ()
 main = arduino $ do
	if firstIteration
 		then randomSeedPin a0
 		else do
 			n <- input (random 10) :: Sketch (Behavior Word32)
 			led =: (n >= 5)

The use of firstIteration makes the RNG be seeded in the first iteration, and then random numbers are generated in subsequent iterations. That's a typical pattern when using this module.