Added license information for Freight train.
Added license information for Freight train.

By SONGKRO. CC0 1.0 Universal (CC0 1.0) Public Domain Dedication.

https://www.blendswap.com/blends/view/46359

`freight_train.fbx` exported with Blender 2.78 (sub 0) from the original
`freight.blend`.

Texture files renamed and exported with Blender 2.78 (sub 0) from the
original `freight.blend`.

	modified:   README.md

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