Add IMU data units in documentation

[devashishraj]

Please , update documentation to include information by physical unit of data received from chassis feedback ?

Received: {"T":1001,"L":-0.380418691,"R":0.378527942,"ax":220,"ay":-128,"az":7724,"gx":-62,"gy":-54,"gz":1362,"mx":-196,"my":112,"mz":439,"odl":59,"odr":-61,"v":1166}
Received: {"T":1001,"L":-0.38079911,"R":0.571198664,"ax":-512,"ay":-230,"az":7216,"gx":-101,"gy":19,"gz":2070,"mx":-252,"my":155,"mz":451,"odl":57,"odr":-59,"v":1166}
Received: {"T":1001,"L":-0.571198664,"R":0.381562234,"ax":-584,"ay":-308,"az":8878,"gx":232,"gy":52,"gz":2446,"mx":-294,"my":116,"mz":488,"odl":55,"odr":-56,"v":1166}
Received: {"T":1001,"L":-0.38079911,"R":0.38079911,"ax":-584,"ay":-308,"az":8878,"gx":232,"gy":52,"gz":2446,"mx":-294,"my":116,"mz":488,"odl":52,"odr":-54,"v":1166}
Received: {"T":1001,"L":-0.571198664,"R":0.380989604,"ax":964,"ay":868,"az":10296,"gx":244,"gy":-77,"gz":2660,"mx":-331,"my":126,"mz":493,"odl":49,"odr":-52,"v":1166}
Received: {"T":1001,"L":-0.571198664,"R":0.38079911,"ax":-302,"ay":-2058,"az":8576,"gx":274,"gy":-337,"gz":2767,"mx":-361,"my":117,"mz":523,"odl":46,"odr":-50,"v":1166}
Received: {"T":1001,"L":-0.571198664,"R":0.38079911,"ax":-302,"ay":-2058,"az":8576,"gx":274,"gy":-337,"gz":2767,"mx":-361,"my":117,"mz":523,"odl":43,"odr":-48,"v":1166}
Received: {"T":1001,"L":-0.571198664,"R":0.380608805,"ax":-376,"ay":-1882,"az":8558,"gx":126,"gy":186,"gz":2600,"mx":-382,"my":75,"mz":502,"odl":40,"odr":-46,"v":1166}

• L and R : meter per second
• odl and odr are ticks

Data from accelerometer, gyroscope and magnetometer are raw values of some kind ?