add README

Author: xlc-dev

README.md

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+# QuickIME
+
+**A fast, private, and simple web-based Input Method Editor that doesn’t suck.**
+
+---
+
+## 🚀 Features
+
+- Zero-server IME: Runs 100% in your browser. No tracking, no back-end, no network calls.
+- Instant Romanization -> Characters: Type phonetic input (e.g. romaji) and get immediate candidate suggestions.
+- Persistent UI Settings saved in localStorage
+- Light / Dark / System Theme
+
+---
+
+## 💻 Getting Started
+
+### Prerequisites
+
+- Node.js >= 22
+- pnpm
+
+### Clone & Install
+
+```bash
+git clone https://github.com/xlc-dev/QuickIME.git
+cd QuickIME
+pnpm install
+```
+
+### Local Development
+
+```bash
+pnpm dev
+```
+
+Open http://localhost:3000 and start typing!
+
+### Production Build
+
+```bash
+# Build the static site
+pnpm build
+
+# Preview the production build locally
+pnpm preview
+```
+
+---
+
+## 🤝 Contributing
+
+1. Fork it
+2. Create your feature branch (`git checkout -b feat/...`)
+3. Commit your changes (`git commit -m "feat: ..."`)
+4. Push to the branch (`git push origin feat/...`)
+5. Open a Pull Request
+
+All contributions are welcome!
+
+---
+
+## 📜 License
+
+GPL-3.0 © 2025 [xlc-dev](https://github.com/xlc-dev)