Add license information for game assets and code

License.txt

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+Game assets with a license file next to them are used under the license described in that file.
+
+All other Crazy Core game assets and code are released under the MIT license.
+
+Engine sources are available under the licenses referenced in the engine submodule.
+
+MIT License
+
+Copyright (c) 2017 Eric Mellino
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# CrazyCore
+Crazy Core is a simple 3D video game built with .NET Core. It supports Windows, OSX, and Linux. It is built on top of a custom game engine, the sources of which can be found here: https://github.com/mellinoe/ge.
+
+This repository contains the game-specific assets and code files for Crazy Core. It has a submodule which includes the engine as a dependency.