Create README.md

Added a README Guide how to run the backend server

Author: mratin12321

README.md

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+# Function Builder Backend
+
+This is the backend server for the Function Builder game, responsible for handling multiplayer game rooms, player interactions, and game logic in real-time using `Node.js` and `Socket.IO`.
+
+## Prerequisites
+
+Before you begin, ensure you have the following installed on your machine:
+
+- **Node.js**: You can download it from [nodejs.org](https://nodejs.org/).
+- **npm** (Node Package Manager): This is included with Node.js.
+
+## Getting Started
+
+Follow these instructions to set up and run the backend server locally.
+
+### 1. Clone the Repository
+
+First, clone the repository to your local machine:
+
+git clone https://github.com/Gamify-IT/functionbuilder-backend.git
+cd functionbuilder-backend
+
+### 2. Install Dependencies
+Run the following command to install the required dependencies:
+
+npm install
+
+3. Run the Server
+To start the server, run the following command:
+
+node server.js
+
+
+You can test the backend using a tool like Postman or curl. The following endpoints are available:
+
+GET /roomState: Fetches the current state of all game rooms.
+POST /createRoom: Creates a new game room. You need to pass the roomName and mode in the request body.
+POST /joinRoom: Allows a player to join a specific room. You need to pass the roomId in the request body.
+
+The server uses Socket.IO for real-time communication between clients and the server. Once connected, clients can listen for events such as:
+
+playerJoined: Broadcasts when a new player joins the room.
+startGame: Broadcasts when the game is ready to start.
+playerLeft: Broadcasts when a player leaves the room.
+
+Project Structure
+server.js: Main entry point for the server.
+/node_modules: Contains all installed dependencies.
+package.json: Lists the project dependencies and scripts.