Add stdio client demo

[Vinisha-projects]

This PR introduces a MCP stdio client demo using the official MCP SDK.
The demo demonstrates how to connect to an MCP server via stdio using the recommended client interface.

Motivation and Context

This demo aims to provide a simple and practical example of using the MCP client via stdio.
It helps developers quickly understand how to connect, interact, and retrieve data from an MCP server.
The example is aligned with the official MCP guidelines and best practices.

How Has This Been Tested?

The demo was tested locally on a Windows environment using Python 3.12.
It simulates an MCP server connection and verifies that responses are correctly received and displayed.
The example was executed multiple times to check for stability and correctness.

Breaking Changes

None. The PR introduces an isolated demo script without impacting the core library.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update

Checklist

• I have read the MCP Documentation
• My code follows the repository's style guidelines
• New and existing tests pass locally
• I have added appropriate error handling
• I have added or updated documentation as needed

Additional context

n/a

[ihrpr]

thank you, we appreciate you contribution, we already have examples/clients/simple-chatbot/mcp_simple_chatbot for stdio client demo purposes