docs: add README.md with project overview and setup instructions

README.md

+# Minecraft Statistics Server (demo)
+
+This project is a demonstration of a RESTful API backend for managing player statistics and shops in a Minecraft server. The API allows you to retrieve information about players and shops, manage shop inventories, and simulate player transactions.
+
+## Features
+
+- **Player Management**
+    - Retrieve all players
+    - Retrieve online and offline players
+    - Get detailed information about a specific player
+
+- **Shop Management**
+    - Retrieve all shops
+    - Get details of a specific shop
+    - Buy items from a shop
+    - Set prices and stock for items in a shop
+
+## Technologies Used
+
+- **Java 17**
+- **Spring Boot**
+- **Spring Web**
+- **JUnit & Mockito** for testing
+
+## Getting Started
+
+### Prerequisites
+
+- Java 17 or higher
+- Maven
+
+### Installation
+
+1. Clone the repository:
+   ```bash
+   git clone https://gitlab.sl-projects.com/SofianeLasri/demo-culture-concepts-info.git
+   ```
+
+2. Navigate to the project directory:
+   ```bash
+   cd demo-culture-concepts-info
+   ```
+
+3. Build the project using Maven:
+   ```bash
+   mvn clean install
+   ```
+
+4. Run the application:
+   ```bash
+   mvn spring-boot:run
+   ```
+
+The server will start and listen on `http://localhost:8080`.
+
+## API Endpoints
+
+### Player Endpoints
+
+- **GET /players**: Retrieve a list of all players.
+- **GET /online-players**: Retrieve a list of online players.
+- **GET /offline-players**: Retrieve a list of offline players.
+- **GET /player**: Retrieve information about a specific player by UUID.
+
+### Shop Endpoints
+
+- **GET /shops**: Retrieve a list of all shops.
+- **GET /shop**: Retrieve information about a specific shop by item name.
+- **GET /buy**: Simulate buying an item from a shop.
+- **GET /set-price**: Set the price of an item in a shop.
+- **GET /set-stock**: Set the stock of an item in a shop.
+
+## Testing
+
+Run the tests using Maven:
+
+```bash
+mvn test
+```
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