Address #179 so example in README.md will run

[jwoehr]

"class must be constructable through the container"

Example didn't run as written.

Motivation and Context

Added a __construct and example works.

How Has This Been Tested?

Run at home.

Breaking Changes

No.

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)
• [ x] 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
• [ x] I have added or updated documentation as needed

Additional context

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