docs: add README with project overview and screenshot

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

README.md

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+# Greyhaven Design System
+
+A modern design system built with Next.js, shadcn/ui, and Radix UI primitives.
+
+![Screenshot](docs/screenshot.png)
+
+## Getting Started
+
+```bash
+# Install dependencies
+pnpm install
+
+# Start development server
+pnpm dev
+
+# Build for production
+pnpm build
+
+# Start production server
+pnpm start
+```
+
+## Project Structure
+
+```
+greyhaven-design-system/
+├── app/                    # Next.js app directory
+│   ├── layout.tsx          # Root layout with fonts
+│   ├── page.tsx            # Design system showcase
+│   └── globals.css         # Global styles
+├── components/
+│   ├── ui/                 # Reusable UI components (57 components)
+│   ├── design-system/      # Showcase components
+│   └── theme-provider.tsx  # Theme context
+├── hooks/                  # Custom React hooks
+├── lib/
+│   └── utils.ts            # Utility functions
+├── styles/                 # Additional styles
+└── public/                 # Static assets
+```
+
+## Tech Stack
+
+- **Framework:** Next.js 16, React 19, TypeScript
+- **Styling:** Tailwind CSS 4, shadcn/ui, Radix UI
+- **Forms:** React Hook Form, Zod
+- **Theming:** next-themes (light/dark mode)