Add Blink code for embed.

Author: kattni

CircuitPython_Templates/blink/code.py

@@ -0,0 +1,13 @@
+"""CircuitPython Blink Example - the CircuitPython 'Hello, World!'"""
+import time
+import board
+import digitalio
+
+led = digitalio.DigitalInOut(board.LED)
+led.direction = digitalio.Direction.OUTPUT
+
+while True:
+    led.value = True
+    time.sleep(0.5)
+    led.value = False
+    time.sleep(0.5)