Add SPDX

TheKitty · web-flow · commit 3c075fa35a03 · 2022-03-01T12:54:28.000-05:00
diff --git a/Adafruit_ESP32_Arduino_Demos/ESP32_sleeptest/ESP32_sleeptest.ino b/Adafruit_ESP32_Arduino_Demos/ESP32_sleeptest/ESP32_sleeptest.ino
@@ -1,3 +1,7 @@
+// SPDX-FileCopyrightText: 2022 Limor Fried for Adafruit Industries
+//
+// SPDX-License-Identifier: MIT
+
 #include <Adafruit_NeoPixel.h>
 
 #if defined(PIN_NEOPIXEL)
