docs: Add Copilot CLI setup documentation

[juangcarmona]

• Create docs/copilot-cli-setup.md with installation instructions for GitHub Copilot CLI
• Update README.md with Copilot CLI Quick Start section
• Document the two-step installation process: marketplace add followed by install
• Follow existing documentation patterns and formatting

[prasadgaikwad]

• Create docs/copilot-cli-setup.md with installation instructions for GitHub Copilot CLI
• Update README.md with Copilot CLI Quick Start section
• Document the two-step installation process: marketplace add followed by install
• Follow existing documentation patterns and formatting

this is awesome, thanks @juangcarmona, I was about to add copilot cli instructions and thought of searching existing PRs/issues first!

@addyosmani we should merge this for copilot cli fans :)

[mvn-dongho-dn]

Implementation complete.

• Commit: 2e34340
• Files changed: 7 (5 seed modules + test + package.json scripts)
• Tests: 150 API + 40 web + 203 shared = 393 passing

Key points:

• pnpm db:seed / pnpm db:reset wired via tsx src/seed/index.ts (--reset flag drops DB first)
• All upserts use $setOnInsert — idempotent by design (tested: 2x run leaves 1 demo project, 5 templates, 1 user)
• Demo user: [email protected] / password123
• 5 system templates: Screen Spec, Use Case, API Spec, Business Rule, Database Schema (all with {{placeholders}})
• 3 demo documents: Getting Started folder + Welcome child + Architecture Overview root

→ Ready for dev review.

[juangcarmona]

This small and doc-scoped PR has been waiting for three weeks...

[JoshZ520]

I'm new to GitHub and have never seen the workflow awaiting approval before. Seeing this makes me want to learn more and make sure I understand it when working with GitHub in a bigger team