Summary

Add a full Rust example to the Build an MCP client documentation page.

The Rust MCP client code was implemented manually and is already merged in modelcontextprotocol/quickstart-resources#59. This PR documents how to build and run that existing example step by step.

How Has This Been Tested?

I personally recreated the Rust client from a new Cargo project by following the documentation step by step, without copying the completed quickstart source file.

The following checks were completed:

• Ran cargo fmt --check
• Ran cargo check
• Verified bare cargo run prints the expected usage message
• Connected the client to the Rust weather MCP server
• Confirmed the client discovered the get_forecast and get_alerts tools

AI Assistance Disclosure

The Rust client coding example was implemented manually. AI assistance was used only to help write and refine the documentation. I personally reviewed the documentation and performed the step-by-step verification described above to confirm that the example works.

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