Add README with project documentation

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README.md

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+# DruckWerk
+
+A professional 3D printer enclosure documentation site built with SvelteKit.
+
+## About
+
+DruckWerk documents the construction of a professional 3D printer enclosure built from an IKEA table. The enclosure features:
+
+- Fixed 230V power input via IEC C14
+- Internal AC distribution via WAGO terminals
+- Dual-output PSU (12V + 5V)
+- ESP32 control with PWM for LEDs and fans
+- Home Assistant integration
+- Cleanly separated AC and DC zones
+- BME280 temperature and humidity sensor
+- Carbon filter exhaust system
+
+## Tech Stack
+
+- [SvelteKit](https://kit.svelte.dev/) - Web framework
+- [Svelte 5](https://svelte.dev/) - UI framework
+- [Tailwind CSS 4](https://tailwindcss.com/) - Styling
+- [TypeScript](https://www.typescriptlang.org/) - Type safety
+- [Lucide](https://lucide.dev/) - Icons
+
+## Features
+
+- Bilingual support (English / German)
+- Dark / Light theme toggle
+- Responsive design
+- Component-based documentation structure
+- Materials list with specifications
+- Step-by-step build instructions
+- Wiring diagrams and pinouts
+- Final safety checklist
+
+## Development
+
+```bash
+# Install dependencies
+npm install
+
+# Start development server
+npm run dev
+
+# Build for production
+npm run build
+
+# Preview production build
+npm run preview
+```
+
+## Project Structure
+
+```
+src/
+├── lib/
+│   ├── components/    # Reusable UI components
+│   ├── data/          # Materials and specifications
+│   ├── i18n/          # Translations (en, de)
+│   └── stores/        # Svelte stores (language, theme)
+├── routes/            # SvelteKit pages
+└── app.css            # Global styles
+```
+
+## License
+
+This project is licensed under the GPL-3.0-or-later license. See [LICENSE](LICENSE) for details.