Add instructions to run the server

examples/tcp-chat-server/README.md

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+# TCP Chat Server
+
+[![Star on Github](https://img.shields.io/badge/-Star%20on%20Github-blue?style=social&logo=github)](https://github.com/ballerina-platform/module-ballerina-tcp)
+
+## Overview
+
+A simple TCP chat server implementation in Ballerina that allows multiple clients to connect and exchange messages. Each message is broadcast to all connected clients with a sequential message number.
+
+## Features
+
+- Supports multiple concurrent client connections
+- Broadcasts messages to all connected clients
+- Sequential message numbering
+- Handles client disconnections gracefully
+- Welcome message for new clients
+
+## Run the Server
+
+```sh
+# Start the server
+$ bal run
+```
+
+## Connect as Client
+
+You can connect using either telnet or netcat:
+
+```sh
+# Using telnet
+$ telnet localhost 3000
+
+# Using netcat
+$ nc localhost 3000
+```
+
+## Testing
+
+1. Open multiple terminal windows
+2. Start the server in one terminal
+3. Connect multiple clients using telnet/netcat in other terminals
+4. Type messages in any client terminal and press Enter
+5. Observe the broadcast messages in all client terminals
+
+Each message will be prefixed with a sequential number and broadcast to all connected clients.
+
+## Implementation Details
+
+The server uses Ballerina's TCP module to:
+
+- Listen for incoming connections on port 3000
+- Maintain a map of connected clients
+- Buffer incoming messages until newline
+- Broadcast messages to all connected clients
+- Handle client disconnections