Add Docker image for Manifold MCP

[tiovikram]

What

Manifold Markets MCP requires the installation of Node JS

Why

Users that may not have node installed or want to wrangle node installation paths to run the MCP may want to use the Manifold Markets MCP. Running the MCP locally through Node has also been finicky for MCP users using other MCPs.

How

Create a docker image of the MCP that users can run the Manifold Markets MCP through

Task Items

1. Add Dockerfile that permits building the Manifold Markets MCP as a Docker image to the repository
2. Push the Docker image to a publicly accessible container registry so that users may download and use the Docker image
3. Update section 3. Configure MCP Settings in repository README.md with the following instructions to run the MCP via Docker

docker pull <DOCKER_REGISTRY_NAME>/<MANIFOLD_MCP_DOCKER_IMAGE_NAME>:latest

{
  "mcpServers": {
    "manifold": {
      "command": "docker",
      "args": [
        "run",
        "--rm",
        "-i",
        "-e",
        "MANIFOLD_API_KEY",
        "<MANIFOLD_MCP_LOCAL_DOCKER_IMAGE_NAME>"
      ],
      "env": {
        "MANIFOLD_API_KEY": "your_api_key_here"
      }
    }
  }
}