Add CRC and indicator description to readme
Add CRC and indicator description to readme

zegervdv/Quadcopter,zegervdv/Quadcopter,zegervdv/STM-Quadcopter,zegervdv/STM-Quadcopter,zegervdv/STM-Quadcopter,zegervdv/Quadcopter,zegervdv/Quadcopter,zegervdv/STM-Quadcopter