Add README with license notice

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+# Shadowclad
+
+## License
+
+Copyright 2018-2020 Iwo 'Outfrost' Bujkiewicz
+
+Except for assets explicitly noted below, this project is licensed
+under the Mozilla Public License, version 2.0. See the LICENSE file
+or http://mozilla.org/MPL/2.0/ for details.
+
+The files:
+* `assets/TexturesCom_MetalGalvanized0045_1_seamless_S.tga`
+* `assets/wall01side.tga`
+
+have been created with photographs from Textures.com. These photographs
+may not be redistributed by default; please visit www.textures.com for
+more information. These files are provided for personal use only, strictly
+as part of Shadowclad as a complete game. Unless expressly permitted
+otherwise by Textures.com, they must be removed from any derivative works.