Add README and test GitHub Actions deployment

README.md

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+# Lucidia Metaverse
+
+Complete 3D metaverse platform deployed to lucidia.earth
+
+## Features
+- Three.js 3D rendering engine
+- Cannon.js physics simulation  
+- Procedural cityscape generation
+- Floating islands with portals
+- Particle effects and dynamic sky
+- WebXR/VR support
+- Multiplayer chat (Socket.io ready)
+
+## Deployment
+Automatically deployed to Cloudflare Pages via GitHub Actions.
+
+🚀 Live at: https://lucidia.earth