Update README with Docker usage

[qrpike]

Summary

• document how to run the Polygon MCP server using Docker

Testing

• python -m compileall -q src entrypoint.py
• pip check

[Copilot]

Pull Request Overview

This PR updates the README to document how to run the Polygon MCP server using Docker.

• Added a "Running with Docker" section with step-by-step instructions.
• Provided commands for building the Docker image and starting the container.

[Copilot]

[nitpick] Consider clarifying that 'docker compose' requires Docker Compose v2 or later; if support for older versions is needed, add a note or alternative command.

[DanStough]

What does your Claude config look like when it's running in the container?

[qrpike]

What does your Claude config look like when it's running in the container?

I was wondering the same thing. Since it doesn't seem to be using a port, I'm not sure how it would run it unless it was with docker exec {container_name}

[DanStough]

Yeah, we would need to implement #10 to be able to do it out of process AFAIK.