Add simple keypad macropad example

Keypad_Examples/macropad_simple/code.py

@@ -0,0 +1,37 @@
+import board
+import keypad
+import neopixel
+
+KEY_PINS = (
+    board.KEY1,
+    board.KEY2,
+    board.KEY3,
+    board.KEY4,
+    board.KEY5,
+    board.KEY6,
+    board.KEY7,
+    board.KEY8,
+    board.KEY9,
+    board.KEY10,
+    board.KEY11,
+    board.KEY12,
+)
+
+keys = keypad.Keys(KEY_PINS, value_when_pressed=False, pull=True)
+
+neopixels = neopixel.NeoPixel(board.NEOPIXEL, 12, brightness=0.4)
+
+while True:
+    event = keys.events.get()
+    if event:
+        # A key transition occurred.
+        print(event)
+
+        if event.pressed:
+            # Turn the key blue when pressed
+            neopixels[event.key_number] = (0, 0, 255)
+
+        # This could just be `else:`,
+        # since event.pressed and event.released are opposites.
+        if event.released:
+            neopixels[event.key_number] = (0, 0, 0)