Add README for GitHub Pages deployment

Author: Parsa Azari

README.md

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+# 3D Portfolio
+
+A Three.js-powered 3D portfolio website showcasing interactive environments and experiences.
+
+## Features
+
+- 3D environment exploration
+- Interactive elements
+- Film poster showcase
+- Performance optimized WebGL rendering
+
+## Deployment
+
+Deployed using GitHub Pages at https://parsaa74.github.io/3D-Portfolio/
+
+<!-- Updated for GitHub Pages deployment -->