Feat: add small README for website

website/README.md

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+# Doux Website
+
+Documentation and playground for the Doux synthesizer.
+
+## Credits
+
+Doux is a Rust port of [Dough](https://codeberg.org/uzu/dough), originally written in C by [Felix Roos](https://codeberg.org/froos). Dough is part of the [TidalCycles](https://tidalcycles.org) ecosystem. Consider [supporting the project](https://opencollective.com/tidalcycles).
+
+## Architecture
+
+- **SvelteKit** with static adapter for GitHub Pages deployment
+- **mdsvex** for markdown-based documentation in `src/content/`
+- **WASM module** (`static/doux.wasm`) — the synthesizer engine
+- **COI service worker** for Cross-Origin Isolation — browsers require `Cross-Origin-Opener-Policy` and `Cross-Origin-Embedder-Policy` headers to enable `SharedArrayBuffer`, which is needed for audio worklets. Since GitHub Pages doesn't allow custom headers, the service worker injects them client-side.
+
+### Directory Structure
+
+```
+src/
+├── content/     # Markdown documentation files
+├── lib/         # Shared components and utilities
+├── routes/
+│   ├── native/     # Native build downloads
+│   ├── reference/  # API reference pages
+│   └── support/    # Support pages
+└── app.html     # HTML shell
+```
+
+## Development
+
+```bash
+pnpm install
+pnpm dev
+```
+
+## Build
+
+```bash
+pnpm build
+```
+
+Output goes to `build/`.
+
+## Deployment
+
+Automatic via GitHub Actions on push to `main`. The workflow:
+
+1. Builds the static site with `pnpm build`
+2. Deploys to GitHub Pages
+
+See `.github/workflows/deploy.yml` for details.
+
+## License
+
+AGPL-3.0