Add readme

Author: tgjones

LICENSE

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+Copyright (c) 2016-2018, Tim Jones
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without modification
+, are permitted provided that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright notice, this 
+   list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright notice, 
+   this list of conditions and the following disclaimer in the documentation 
+   and/or other materials provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

LICENSE.txt

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+# Shader Playground
+
+Shader Playground is a website for exploring shader compilers.
+
+* [Visit website](http://shader-playground.timjones.io)
+
+![](art/screenshot.jpg)
+
+## Supported compilers
+
+* [DXC](https://github.com/Microsoft/DirectXShaderCompiler)
+* [FXC](https://msdn.microsoft.com/en-us/library/windows/desktop/bb232919(v=vs.85).aspx)
+* [Glslang](https://github.com/KhronosGroup/glslang)
+* [HLSLcc](https://github.com/Unity-Technologies/HLSLcc)
+* [Mali offline compiler](https://developer.arm.com/products/software-development-tools/graphics-development-tools/mali-offline-compiler)
+* [Slang](https://github.com/shader-slang/slang)
+* [SPIRV-Cross](https://github.com/KhronosGroup/SPIRV-Cross)
+* [SPIRV-Cross - Intel fork with ISPC backend](https://github.com/GameTechDev/SPIRV-Cross)
+* [SPIRV-Tools](https://github.com/KhronosGroup/SPIRV-Tools)
+  * spirv-cfg
+* [XShaderCompiler](https://github.com/LukasBanana/XShaderCompiler)
+
+## Contributions
+
+Contributions are gratefully accepted. If you want to add a new compiler, or improve integration with an existing compiler, or any other type of bug fix or improvement to the website, please open an [issue](https://github.com/tgjones/shader-playground/issues).
+
+## Author
+
+[Tim Jones](http://timjones.io)