Add license and attribution for used code.

robot/raspbot_v2_interface/Raspbot_Lib/Raspbot_Lib.py

@@ -1,5 +1,12 @@
 #!/usr/bin/env python3
 # coding: utf-8
+#
+# Source: Yahboom RASPBOT-V2 hardware library
+# Origin: https://www.yahboom.net/study/RASPBOT-V2
+# Copyright: Yahboom Technology Co., Ltd.
+# No explicit open-source license provided by the upstream source.
+# Included here unmodified for hardware compatibility.
+#
 import smbus
 import time,random
 import math