Add README with project context and demo link (#2)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

Author: zero2sudo

README.md

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+# DataViz Studio
+
+A drag-and-drop data visualization tool built with React, TypeScript, and Vega-Lite.
+
+## About This Project
+
+This repository is a demonstration of [Claude Code](https://claude.com/claude-code) and Claude Opus 4.5, created by [zero2sudo](https://instagram.com/zero2sudo) in partnership with Anthropic.
+
+### Educational Resource
+
+This project serves as an educational resource for students and developers who want to see how a senior engineer uses Claude Code to build real applications. Feel free to explore the codebase, review the commit history, and learn from the development process.
+
+## Live Demo
+
+Try the application yourself: **https://zero2sudo.github.io/datavisualization/**
+
+## Features
+
+- Drag-and-drop interface for building charts
+- Automatic field type detection (quantitative, nominal, temporal)
+- Real-time Vega-Lite chart rendering
+- Support for X, Y, Color, and Size encodings
+
+## Getting Started
+
+```bash
+npm install
+npm run dev
+```
+
+## Connect
+
+Follow for more content: [instagram.com/zero2sudo](https://instagram.com/zero2sudo)