Orbitcontrols add types

[LauferAlex]

Why

Adding missign types to the OrbitControls example. Problem arrises when the .saveState and reset methods are used and access to the target0, position0 and zoom0 properties is sought but they are not publicly accesible.

What

Definition added for:

target0: Vector3; 
position0: Vector3; 
zoom0: number;

Checklist

• Added myself to contributors table
• Ready to be merged

[LauferAlex]

Thank you for accepting my pull request. Currently, I'm working in a project and a I would like to know if you can tell how much time is going to take updating the definitions of DefinitelyTyped of Three?
@joshuaellis