added readme and removed wasm stuff from flake and cmake

readme.md

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+# RmlUi + Raylib
+
+This project aims to create a fully featured Raylib backend and renderer for Rmlui projects.
+
+I originally began creating this for a Game Jam project where I got the basic rendering implemented, but realized it would be nice to have as a seperate project to flesh out the rest of the features.
+
+## Roadmap
+*Rendering features (from the RmlUi render interfface documentation https://mikke89.github.io/RmlUiDoc/pages/cpp_manual/interfaces/render.html#feature-table):*
+- [x] Basic rendering 
+- [ ] Clip Mask
+- [ ] Transforms
+- [ ] Layers
+- [ ] Render textures
+- [ ] Mask images
+- [ ] Filters
+- [ ] Shaders
+
+*Backend features:*
+- [x] Input handling