add project README

README.md

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-# group-2-threaded-project-petshop
+# PetShop
+
+A pet store management application with a Spring Boot API serving three clients: a Next.js web app, a JavaFX desktop app, and an Android app.
+
+Handles product sales, pet adoption, appointment booking, real-time chat, AI assistance, payments (Stripe), email notifications (Resend), and file storage (Azure Blob).
+
+## Tech Stack
+
+| Layer | Technology |
+|-------|------------|
+| API | Java 25, Spring Boot 4, Spring Security (JWT), Hibernate |
+| Database | MySQL 8.0, Flyway migrations |
+| Web | Next.js 16, React 19, Tailwind CSS 4 |
+| Desktop | JavaFX, Maven |
+| Android | Kotlin, Hilt, Retrofit, CameraX |
+| Infra | Docker, Azure Container Apps |
+
+## Project Structure
+
+```
+main/
+  backend/      Spring Boot REST API
+  web/          Next.js frontend
+  desktop/      JavaFX desktop client
+  android/      Android mobile app
+```
+
+## Prerequisites
+
+- Java 25
+- Node.js 18+
+- Docker
+- Maven
+- Android Studio (for mobile)
+
+## Getting Started
+
+### 1. Start the database
+
+```sh
+cd backend
+docker compose -f docker-compose.dev.yml up -d
+```
+
+### 2. Configure the backend
+
+```sh
+cd backend
+cp .env.example .env
+```
+
+Fill in `.env` with your keys:
+
+```
+JWT_SECRET=<openssl rand -base64 32>
+STRIPE_SECRET_KEY=sk_test_...
+OPENROUTER_API_KEY=sk-or-v1-...
+RESEND_API_KEY=re_...
+RESEND_FROM=PetShop <no-reply@yourdomain.com>
+```
+
+### 3. Run the backend
+
+```sh
+cd backend
+mvn spring-boot:run
+```
+
+The API starts at `http://localhost:8080`. Flyway runs migrations and seeds data automatically on first boot.
+
+### 4. Run the web frontend
+
+```sh
+cd web
+cp .env.example .env.local
+npm install
+npm run dev
+```
+
+The web app starts at `http://localhost:3000`.
+
+### 5. Run the desktop client (optional)
+
+```sh
+cd desktop
+cp connectionpetstore.properties.example connectionpetstore.properties
+mvn javafx:run
+```
+
+### 6. Run the Android app (optional)
+
+Open `android/` in Android Studio and run on an emulator or device.
+
+## API
+
+A Postman collection is available at `backend/postman/`. Key endpoint groups:
+
+- `/api/auth` -- registration, login, password reset
+- `/api/products` -- catalog and inventory
+- `/api/pets` -- listings and adoption
+- `/api/appointments` -- booking
+- `/api/cart`, `/api/sales`, `/api/refunds` -- transactions
+- `/api/chat` -- messaging and AI assistant
+- `/ws` -- WebSocket (STOMP) for real-time updates
+
+## Docker (full stack)
+
+```sh
+cd backend
+docker compose up --build -d
+```
+
+Starts the API and MySQL together. The web frontend has its own Dockerfile for independent deployment.