docs: add git and Node.js prerequisites to README with winget/Homebrew install steps

[Copilot]

Users hitting spawn git ENOENT or npx failed to connect to azure had no guidance in the README about required dependencies. This adds a Prerequisites section documenting the root causes and install paths.

Changes

• New ### Prerequisites section under ## Usage covering:
  • Git — required for /plugin marketplace add; shows the exact error on failure; winget + Homebrew install commands
  • Node.js — required for the Azure MCP server; shows platform-specific errors (npx not found / command not recognized); winget + Homebrew install commands
• Moved existing install steps under ### Installation sub-heading for clearer structure

Original prompt

---

This section details on the original issue you should resolve

<issue_title>[Skill Bug]: Update the setup instruction to include git and node installation using winget</issue_title>
<issue_description>### Preflight Checklist

• I have installed the latest version of GitHub Copilot for Azure in VS Code.
• I have checked existing resources, including using the /help command in the chat window.
• I have searched for similar issues.

Repro Steps

install copilot cli in an environment without git, node. It fails to install /plugin marketplace add microsoft/github-copilot-for-azure
and fails with error
Failed to add marketplace: Failed to fetch GitHub marketplace microsoft/github-copilot-for-azure: Error: spawn git ENOENT

when you dont have node installed, azure mcp server fails to load with this error - npx failed to connect to azure

Prompt

Issue at installation level

Expected Result

Update the readme file

Actual Result

user needs to figure out missing pieces

Attachments

No response

Regression?

No response

Additional Context

No response</issue_description>

<agent_instructions>Update https://github.com/microsoft/GitHub-Copilot-for-Azure/blob/main/README.md to state the dependencies on git to install marketplace plugin and install node for azure mcp server. add steps using winget and homebrew</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes [Skill Bug]: Update the setup instruction to include git and node installation using winget #1063

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[Copilot]

Pull request overview

Adds missing setup guidance to the main README so users know they must have Git (for marketplace plugin install) and Node.js (for the Azure MCP server) before following the usage steps, reducing common ENOENT / npx failures during setup.

Changes:

• Introduces a new Prerequisites section under Usage documenting required dependencies (Git, Node.js) and common failure messages.
• Adds Windows (winget) and macOS (Homebrew) install commands for Git and Node.js.
• Moves the existing install steps under a new Installation subheading for clearer structure.

[github-actions]

🔍 Token Analysis Report

@github-copilot-for-azure/scripts@1.0.0 tokens
node --import tsx src/tokens/cli.ts compare --base origin/main --head HEAD --markdown

📊 Token Change Report

Comparing origin/main → HEAD

Summary

Metric	Value
📈 Total Change	+234 tokens (+64%)
Before	368 tokens
After	602 tokens
Files Changed	1

Changed Files

File	Before	After	Change
README.md	368	602	+234 (+64%)

@github-copilot-for-azure/scripts@1.0.0 tokens
node --import tsx src/tokens/cli.ts check --markdown

📊 Token Limit Check Report

Checked: 405 files
Exceeded: 113 files

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Consider moving content to references/ subdirectories.

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Automated token analysis. See skill authoring guidelines for best practices.