Add Dev Container support for MCP configuration

[Copilot]

This PR adds MCP (Model Context Protocol) server configuration to the dev container setup, enabling enhanced AI assistant capabilities for GitHub and Microsoft documentation access.

Changes Made

Dev Container Configuration

• Added Node.js feature to support running MCP servers via npx
• Configured two MCP servers in .devcontainer/devcontainer.json:
  • GitHub MCP Server: Provides access to GitHub repositories, issues, pull requests, and other GitHub resources
  • Microsoft Docs MCP Server: Enables access to Microsoft documentation and learning resources

Documentation Updates

• Updated README.md to highlight MCP configuration as a project feature
• Added detailed documentation section explaining the MCP server setup and requirements
• Documented the need for a GITHUB_TOKEN environment variable for GitHub server authentication

Configuration Details

The MCP servers are configured to run automatically when the dev container starts:

"mcp": {
  "servers": {
    "github": {
      "command": "npx",
      "args": ["-y", "@modelcontextprotocol/server-github"],
      "env": {
        "GITHUB_PERSONAL_ACCESS_TOKEN": "${containerEnv:GITHUB_TOKEN}"
      }
    },
    "microsoft-docs": {
      "command": "npx",
      "args": ["-y", "@modelcontextprotocol/server-microsoft-docs"]
    }
  }
}

This enables AI assistants working within the dev container to access external GitHub and Microsoft documentation resources, improving the development experience.

Fixes #21.

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