NPhysics Amethyst backend

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This crate is the [NPhysics] integration of the [amethyst_physics] interface.

To use this backend you have to specify the class NPhysicsBackend in the PhysicsBundle as shown below.

```rust use amethystphysics::PhysicsBundle; use amethyst::amethystnphysics::NPhysicsBackend;

let gamedata = GameDataBuilder::default() .withbundle(PhysicsBundle::::new()).unwrap() ```

You can use this through [amethyst_physics].