Add license.

Author: kattni

examples/seesaw_rotary_neopixel.py

@@ -1,3 +1,6 @@
+# SPDX-FileCopyrightText: 2021 Kattni Rembor for Adafruit Industries
+# SPDX-License-Identifier: MIT
+
 """I2C rotary encoder NeoPixel color picker and brightness setting example."""
 import board
 from adafruit_seesaw import seesaw, neopixel, rotaryio, digitalio