docs: enhance README with features, tech stack, and project structure

Author: kasvith

README.md

@@ -1,6 +1,23 @@
 # Op Notes
 
-Surgery notes management system for hospitals.
+A cross-platform desktop application for managing surgical notes in hospitals. Built with Electron, React, and SQLite.
+
+## Features
+
+- **Patient Management**: Track patient records with PHN, demographics, and contact information
+- **Surgery Records**: Document surgeries with operation notes, post-op notes, and follow-ups
+- **Doctor Management**: Maintain doctor profiles with designations and SLMC registration
+- **Full-Text Search**: Quickly find patients, surgeries, and doctors
+- **Print Support**: Generate printable operation notes and follow-up records
+- **Offline-First**: All data stored locally in SQLite database
+
+## Tech Stack
+
+- **Frontend**: React 18, TypeScript, Tailwind CSS, Radix UI
+- **Backend**: Electron 28, SQLite (better-sqlite3), Kysely
+- **Build**: electron-vite, electron-builder
+- **Forms**: React Hook Form + Zod validation
+- **Data Fetching**: TanStack React Query
 
 ## Recommended IDE Setup
 
@@ -32,3 +49,32 @@ $ pnpm build:mac
 # For Linux
 $ pnpm build:linux
 ```
+
+### Other Commands
+
+```bash
+$ pnpm lint          # Run ESLint with auto-fix
+$ pnpm typecheck     # TypeScript type checking
+$ pnpm format        # Format code with Prettier
+```
+
+## Project Structure
+
+```
+src/
+├── main/            # Electron main process
+│   ├── db/          # Database migrations
+│   └── repository/  # Data access layer
+├── preload/         # Electron preload scripts (IPC bridge)
+├── renderer/        # React frontend
+│   └── src/
+│       ├── components/  # UI components
+│       ├── routes/      # Page components
+│       ├── contexts/    # React Context providers
+│       └── hooks/       # Custom React hooks
+└── shared/          # Shared types and models
+```
+
+## License
+
+MIT