Adding template project

README.md

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+# RmlUi Application Project Template (Nix Flake)
+
+This is a template project for an RmlUi application, with Nix support.
+
+## Template features:
+- Enabled plugins: SVG, Lua
+- Hot reload RML/RCSS/Lua with F5 key
+- Customizable "shell" rml with inner page loading and page state tracking
+- application state manager 
+- Basic stylesheet for common html/rml controls, with a user-agent styleheet that takes priority
+- Easily defined custom rml controls
+- GLFW/GL3 backend, but all premade backends are included in the vendor folder
+- Nix Flake included with a dev shell env and `nix build` capabilities +0 wrapped binary 
+
+Other libraries included:
+- Raylib
+
+Nix Flake features:
+- Dev shell
+    - LSP for C++ and Lua
+- Building & running
+- RmlUi pinned to v6.2