added examples folder and .py file

examples/randomcolor.py

@@ -0,0 +1,28 @@
+import time
+import random
+import board
+import adafruit_dotstar as dotstar
+
+# One pixel connected internally on a GEMMA M0
+dots = dotstar.DotStar(board.APA102_SCK, board.APA102_MOSI, 1, brightness=0.2)
+
+# With a Dotstar Digital LEB Strip with 30 lights
+#dots = dotstar.DotStar(board.SCK, board.MOSI, 30, brightness=0.2)
+
+######################### HELPERS ##############################
+
+# a random color 0 -> 224
+def random_color():
+    return random.randrange(0, 7) * 32
+
+######################### MAIN LOOP ##############################
+n_dots = len(dots)
+while True:
+    #fill each dot with a random color
+    for dot in range(n_dots):
+        dots[dot] = (random_color(), random_color(), random_color())
+
+    # show all dots in strip
+    dots.show()
+
+    time.sleep(.25)