Add license info to new file

Author: makermelissa

examples/lidar_test.py

@@ -1,3 +1,7 @@
+# SPDX-FileCopyrightText: 2021 ladyada for Adafruit Industries
+#
+# SPDX-License-Identifier: MIT
+
 from math import floor
 from adafruit_rplidar import RPLidar