docs: add Autohand Code MCP setup

[igorcosta]

Adds a short Autohand Code example beside the existing stdio client configuration in Server/README.md.

The command deliberately reuses the published uvx --from mcpforunityserver mcp-for-unity --transport stdio path, so it stays aligned with the server instructions instead of introducing a separate install method. It also notes the project-scoped option.

Verification:

• Checked the stdio command against the current Autohand Code MCP CLI
• Ran git diff --check

This is documentation-only; no runtime behavior changed.

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