Add QT Py RP example.

QT_Py_RP2040/neopixel_rainbow/code.py

@@ -0,0 +1,22 @@
+"""CircuitPython NeoPixel rainbow example for QT Py RP2040"""
+import time
+import board
+import neopixel
+from _pixelbuf import colorwheel
+
+pixel = neopixel.NeoPixel(board.NEOPIXEL, 1, auto_write=False)
+
+pixel.brightness = 0.3
+
+
+def rainbow(delay):
+    for color_value in range(255):
+        for led in range(1):
+            pixel_index = (led * 256 // 1) + color_value
+            pixel[led] = colorwheel(pixel_index & 255)
+        pixel.show()
+        time.sleep(delay)
+
+
+while True:
+    rainbow(0.02)