Add A1301 - Arduino library for A1301 A1302 magnetometer. (#2177)

* Add AD56X8 - SPI based 8 channel DAC -library

* Add A1301 - Arduino library for A1301 A1302 magnetometer.

Arduino library for A1301 A1302 magnetometer.

Author: RobTillaart

repositories.txt

@@ -3436,6 +3436,7 @@ https://github.com/ROBOTIS-GIT/Dynamixel2Arduino
 https://github.com/ROBOTIS-GIT/DynamixelShield
 https://github.com/ROBOTIS-GIT/ros2arduino
 https://github.com/RobPo/Paperino
+https://github.com/RobTillaart/A1301
 https://github.com/RobTillaart/ACS712
 https://github.com/RobTillaart/AD5144A
 https://github.com/RobTillaart/AD520X