Add a README

README.md

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+Visualizer for the GG party 2019
+================================
+**Fair warning**: This is still in the exact state from show night.  I've only
+upgraded dependencies to make this build on modern systems again but the code
+is the same horrible mess as it was in 2019.
+
+![Picture Tax](./ggparty-19.png)
+
+## License
+Unfortunately, the licensing of this visualizer is unclear due to the included
+assets (shaders & images).