Add default assets

assets/README.md

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+## Texture licenses
+
+Please note that the general license of this repository does not apply to the files listed below, which are contained in this directory only.
+
+#### default.png
+
+8x8px tiled bitmap font by xtreme8000.
+
+License: [Creative Commons Attribution 4.0 International License](https://creativecommons.org/licenses/by/4.0/)
+
+#### terrain.png and items.png
+
+Block and item textures from the [Isabella II](http://www.minecraftforum.net/topic/242175-Isabella/) texture pack by Bonemouse, extracted from the "1.2.5 Beta 1" release (`Isabella 2 1.2vb1.zip`).
+
+License: [Creative Commons Attribution 3.0 Unported License](https://creativecommons.org/licenses/by/3.0/)
+
+#### anim.png and gui2.png
+
+also based on the [Isabella II](http://www.minecraftforum.net/topic/242175-Isabella/) texture pack, see above for more information.
+
+#### gui.png
+
+Inventory gui textures based on the [Isabella II](http://www.minecraftforum.net/topic/242175-Isabella/) texture pack. All input icons on the right of the texture are from the [WiiBrew wiki](https://wiibrew.org/wiki/Category:Controller_Buttons), and either created by users [Clorox](https://wiibrew.org/wiki/User:Clorox),  [Flark](https://wiibrew.org/wiki/User:Flark), [Hiker13526](https://wiibrew.org/wiki/User:Hiker13526) or [Crayon](https://wiibrew.org/wiki/User:Crayon). License seems to be [unknown](https://wiibrew.org/wiki/Category_talk:Controller_Buttons#License).