Clarify project architecture

[jraviotta]

@rockets-cn Please tell me your plan for development. What is the difference between ArduinoUnoDo and ArduinoUnoGravityDo?

[austrocoin]

I see it that the 1st is with new Do from DFRobot and 2nd with DO from Atlas.

[jraviotta]

That makes sense. Thanks for pointing it out.