docs(readme): rewrite project description

README.md

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+# 📚 Book Collection Manager
+
+A simple and modern web app to manage your personal book collection. Built with React and Vite.
+
+## 🌟 What You Can Do
+
+- 📖 View all your books in a responsive grid
+- ➕ Add new books to the collection
+- ✏️ Edit existing book details
+- ❌ Delete books you don’t need anymore
+- 📱 Use it comfortably on mobile or desktop
+- 🎨 Clean and modular styling with CSS Modules
+- 🔄 Connect to a backend to keep everything in sync
+
+## 🛠️ Tech Stack
+
+- **React** for the UI
+- **Vite** as the build tool and dev server
+- **CSS Modules** for scoped styles
+- **Vitest** for testing
+- **ESLint + Prettier** for clean code
+- **Husky** for Git hooks and automation
+
+## 📋 Book Data Structure
+
+```ts
+type Book = {
+  id: number;
+  title: string;
+  author: string;
+  year: number;
+  status: 'pending' | 'in progress' | 'read';
+};
+```