Function nannou::app

pub fn app<M, E>(
    model: ModelFn<M>, 
    update: UpdateFn<M, E>, 
    draw: DrawFn<M>
) -> Builder<M, E> where
    E: LoopEvent, 

Begin building a nannou App.

Every nannou App must have model, update and draw functions.

An exit function can be optionally specified using the exit builder method.