Update README.md

[JFolberth]

Instruction for MCP w/ GitHub Code Agent. Can't use "." as GitHub MCP tries to read this as a sub property.
This pull request updates the README.md file to include configuration details for GitHub in the Microsoft Learn Docs MCP Server installation guide. The new section provides manual configuration instructions, including a detailed view of the JSON configuration required for GitHub.

Updates to installation guide:

• README.md: Added a new entry for GitHub in the MCP Server installation guide, including manual configuration details and a collapsible JSON configuration example.

[Copilot]

Pull Request Overview

This PR updates the README.md installation guide to include a new GitHub configuration section for manual setup with the MCP Server.

• Adds a new table entry for GitHub with configuration details.
• Introduces a collapsible JSON configuration example for users to reference.

Comments suppressed due to low confidence (1)

README.md:67

• The JSON block has inconsistent indentation for the 'tools' key compared to other keys. Consider aligning the indentation for clarity and consistency.

| **GitHub** | Manual configuration required<br/> <details><summary>View Config</summary>**Note**: Navigate to Settings → Coding agent<br/><pre>{<br/>  "docs": {<br/>    "command": "npx",<br/>    "args": [<br/>      "-y",<br/>      "mcp-remote",<br/>      "https://learn.microsoft.com/api/mcp"<br/>    ],<br/> "tools":["*"]<br/>  }<br/>}</pre></details>

[TianqiZhang]

Thanks for the PR @JFolberth ! Would you mind renaming it from "docs" to "mslearn" just for branding consideration?

[JFolberth]

@TianqiZhang, Changes have been submitted