feat(kuwahara): add models examples

models/gltf/kuwahara-effect/plant-jar/license.txt

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+Model Information:
+* title:	Monstera B03
+* source:	https://www.fab.com/listings/081bde6d-8615-4575-ba10-27e8741ea01c
+* author:	TaSeen (https://www.fab.com/sellers/MozzarellaARC)
+
+Model License:
+* license type:	CC-BY-4.0 (http://creativecommons.org/licenses/by/4.0/)
+* requirements:	Author must be credited. Commercial use is allowed.
+
+If you use this 3D model in your project be sure to copy paste this credit wherever you share it:
+This work is based on "Monstera B03" (https://www.fab.com/listings/081bde6d-8615-4575-ba10-27e8741ea01c) by MozzarellaARC (https://www.fab.com/sellers/MozzarellaARC) licensed under CC-BY-4.0 (http://creativecommons.org/licenses/by/4.0/)

models/gltf/kuwahara-effect/watermelon/license.txt

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+Model Information:
+* title:	Watermelon fruit
+* source:	https://sketchfab.com/3d-models/watermelon-fruit-f120452f84bf4e979139b106bf9f096c
+* author:	TaSeen (https://sketchfab.com/catafest)
+
+Model License:
+* license type:	CC-BY-4.0 (https://creativecommons.org/licenses/by/4.0/)
+* requirements:	Author must be credited. Commercial use is allowed.
+
+If you use this 3D model in your project be sure to copy paste this credit wherever you share it:
+This work is based on "Watermelon fruit" (https://sketchfab.com/3d-models/watermelon-fruit-f120452f84bf4e979139b106bf9f096c) by catafest (https://sketchfab.com/catafest) licensed under CC-BY-4.0 (http://creativecommons.org/licenses/by/4.0/)