Create LICENSE_CC_BY_NC_4.0.TXT

Adding assets license file, which is separate from the code license

Signed-off-by: Joe Bryant <[email protected]>

LICENSE_CC_BY_NC_4.0.TXT

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+3D models, image textures, and other asset files are licensed under a Creative Commons Attribution-NonCommercial 4.0 International License, available at http://creativecommons.org/licenses/by-nc/4.0/.