feat: add README.md

Author: rebase

DEVELOPMENT.md

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+# For Developers
+
+## 🛠️ Building from Source
+
+### Prerequisites
+
+- Node.js (v16 or higher)
+- Rust (latest stable)
+- npm or yarn
+
+### Setup
+
+```bash
+# Clone the repository
+git clone https://github.com/rebase/json-prettier.git
+cd json-prettier
+
+# Install dependencies
+npm install
+
+# Run in development mode
+npm run tauri dev
+
+# Build for production
+npm run tauri build
+```
+
+## 📦 Open Source Libraries Used
+
+**Frontend:**
+
+- [React](https://react.dev/) - UI framework
+- [TypeScript](https://www.typescriptlang.org/) - Type safety
+- [Vite](https://vitejs.dev/) - Build tool
+- [Monaco Editor](https://microsoft.github.io/monaco-editor/) - Code editor component
+- [Lucide React](https://lucide.dev/) - Icon library
+
+**Backend (Rust):**
+
+- [Tauri](https://tauri.app/) - Desktop app framework
+- [Serde](https://serde.rs/) - Serialization/deserialization
+- [Serde JSON](https://docs.rs/serde_json/) - JSON handling

INSTALLATION.md

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+# Installation Guide
+
+## macOS Installation
+
+### Security Warning Fix
+
+When you first download and run JSON Prettier on macOS, you may see a security warning:
+
+> "Apple could not verify JSON Prettier.app is free of malware..."
+
+This is normal for apps that aren't signed with an Apple Developer Certificate. To run the app:
+
+**Method 1: System Settings**
+
+1. Go to **System Settings → Privacy & Security**
+2. Find "JSON Prettier.app was blocked" message
+3. Click **"Open Anyway"**
+
+**Method 2: Right-click**
+
+1. Right-click on the app
+2. Select **"Open"**
+3. Click **"Open"** in the dialog
+
+This only needs to be done once. After that, the app will run normally.
+
+## Windows Installation
+
+Download the `.msi` installer and run it. Windows Defender may show a warning - click "More info" → "Run anyway".
+
+## Linux Installation
+
+Download the `.AppImage` file:
+
+1. Make it executable: `chmod +x JSON-Prettier_*.AppImage`
+2. Run: `./JSON-Prettier_*.AppImage`
+
+Or install via package manager if available.
+
+---
+
+**Why this happens**: We're an open-source project and don't have an Apple Developer Certificate ($99/year). The app is completely safe - you can verify the source code on GitHub.

LICENSE

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+MIT License
+
+Copyright (c) 2025 JSON Prettier
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# JSON Prettier
+
+<div align="center">
+  <img src="src-tauri/icons/icon.png" alt="JSON Prettier Logo" width="128" height="128">
+  
+  [![Version](https://img.shields.io/badge/version-0.1.0-blue.svg)](https://github.com/rebase/json-prettier)
+  [![License](https://img.shields.io/badge/license-MIT-green.svg)](LICENSE)
+</div>
+
+---
+
+<div align="center">
+  <table>
+    <tr>
+      <td width="33%" align="center">
+        <img src="docs/images/main-interface.png" alt="Main Interface" width="100%" style="margin-bottom: 5px;">
+        <br>
+        <strong>Main Interface</strong>
+      </td>
+      <td width="33%" align="center">
+        <img src="docs/images/dark-theme.png" alt="Dark Theme" width="100%" style="margin-bottom: 5px;">
+        <br>
+        <strong>Dark Theme</strong>
+      </td>
+      <td width="33%" align="center">
+        <img src="docs/images/settings-panel.png" alt="Settings Panel" width="100%" style="margin-bottom: 5px;">
+        <br>
+        <strong>Settings Panel</strong>
+      </td>
+    </tr>
+  </table>
+</div>
+
+## 📥 Download
+
+<div align="center">
+  <table>
+    <tr>
+      <td align="center" width="33%">
+        <img src="https://upload.wikimedia.org/wikipedia/commons/f/fa/Apple_logo_black.svg" alt="macOS" width="40" height="40">
+        <br>
+        <strong>macOS</strong>
+        <br>
+        <a href="https://github.com/rebase/json-prettier/releases/latest/download/JSON.Prettier_0.1.0_aarch64.dmg">Apple Silicon (M1/M2)</a>
+        <br>
+        <a href="https://github.com/rebase/json-prettier/releases/latest/download/JSON.Prettier_0.1.0_x64.dmg">Intel</a>
+      </td>
+      <td align="center" width="33%">
+        <img src="https://upload.wikimedia.org/wikipedia/commons/5/5f/Windows_logo_-_2012.svg" alt="Windows" width="40" height="40">
+        <br>
+        <strong>Windows</strong>
+        <br>
+        <a href="https://github.com/rebase/json-prettier/releases/latest/download/JSON.Prettier_0.1.0_x64-setup.exe">Setup (.exe)</a>
+        <br>
+        <a href="https://github.com/rebase/json-prettier/releases/latest/download/JSON.Prettier_0.1.0_x64.msi">MSI Installer</a>
+      </td>
+      <td align="center" width="33%">
+        <img src="https://upload.wikimedia.org/wikipedia/commons/3/35/Tux.svg" alt="Linux" width="40" height="40">
+        <br>
+        <strong>Linux</strong>
+        <br>
+        <a href="https://github.com/rebase/json-prettier/releases/latest/download/json-prettier_0.1.0_amd64.AppImage">AppImage</a>
+        <br>
+        <a href="https://github.com/rebase/json-prettier/releases/latest/download/json-prettier_0.1.0_amd64.deb">Debian (.deb)</a>
+      </td>
+    </tr>
+  </table>
+</div>
+
+> **macOS Users**: You may see an "untrusted developer" warning on first launch.
+> Right-click the app and select "Open" to bypass this. See our [Installation Guide](INSTALLATION.md) for details.
+
+---
+
+## 📝 What is JSON Prettier?
+
+JSON Prettier is a simple desktop app that makes messy JSON data look clean and organized. Whether you're a developer, data analyst, or just someone who works with JSON files, this app will help you format and read JSON data easily.
+
+## ✨ Features
+
+- 📂 **Open JSON files** - Load JSON from your computer
+- 💾 **Save formatted JSON** - Export cleaned up data
+- 🔄 **Auto-save settings** - Remembers your preferences
+- 🌙 **Dark/Light themes** - Choose your preferred look
+- 📋 **Copy/Paste support** - Quick text operations
+- 🎨 **Syntax highlighting** - Easy to read colored JSON
+- ⚡ **Fast formatting** - Instant JSON beautification
+
+## 🐛 Something Not Working?
+
+Found a problem? Let us know! Go to our [Issues page](https://github.com/rebase/json-prettier/issues) and tell us:
+
+- What computer you're using (Mac, Windows, Linux)
+- What version of the app you have
+- What you were trying to do
+- What happened vs what you expected
+- A screenshot if possible
+
+## 🛠️ For Developers
+
+Want to contribute or build from source? Check out our [Development Guide](DEVELOPMENT.md)
+
+<div align="center">
+  ⭐ If you find this project useful, please give it a star!
+</div>