Add NeoPixel control code for CPX

Implement NeoPixel control for Circuit Playground Express with a pulsing effect.

Author: TheKitty

Crickits/Make_It_Glow_With_Crickit/CPX-NeoPixels/code.py

@@ -0,0 +1,27 @@
+# SPDX-FileCopyrightText: 2018 Anne Barela for Adafruit Industries
+#
+# SPDX-License-Identifier: MIT
+
+# Use the 10 NeoPixels on Circuit Playground Express via the
+#   Adafruit neopixel library
+import time
+import neopixel
+import board
+
+# Set up the 10 Circuit Playground Express NeoPixels half bright
+CPX_pixels = neopixel.NeoPixel(board.NEOPIXEL, 10, brightness=0.5)
+
+# slowly power up via blue color
+for i in range(50):
+    CPX_pixels.fill((0, 0, i))
+    time.sleep(0.05)
+
+# blast off!
+CPX_pixels.fill((255, 0, 0))
+
+while True:
+    # pulse effect
+    for i in range(255, 0, -5):
+        CPX_pixels.fill((i, 0, 0))
+    for i in range(0, 255, 5):
+        CPX_pixels.fill((i, 0, 0))