This function makes the drone take off and begin hovering.
The drone will always hover for 3 seconds in order to stabilize before it executes the next command.
If it receives no command for 8 seconds, it will automatically land.
//below this have to code in setup
//open serial and connect
CoDrone.takeoff(); // take off and hover for 3 second
CoDrone.hover(3); // hover for 3 second