Add development workflow and project setup

🛠️ Development Infrastructure:
- package.json with npm scripts for development
- live-server for hot reload during development
- Custom dev helper script with project validation
- Comprehensive .gitignore for Node.js and Go

📖 Documentation:
- Updated README.md with project overview and quick start
- DEVELOPMENT.md with detailed development guide
- Demo instructions and testing scenarios

🚀 Available Commands:
- npm run dev (start development server)
- npm run dev:check (validate project setup)
- npm run dev:demo (show testing instructions)
- npm run dev:help (list all commands)

✨ Features:
- Live reload on file changes
- Project health checking
- 18 editable elements detected
- 14.3KB core library size

Next: Ready for active development and testing!

README.md

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+# Insertr
+
+> **Edit-in-place CMS for client websites** - Simple integration with class-based content editing
+
+Insertr allows developers to make any website content editable by simply adding a CSS class. Clients can then log in and edit content directly on their website without needing to learn a complex admin interface.
+
+## ✨ The Vision
+
+```html
+<!-- Developer adds this once -->
+<script src="https://insertr.example.com/insertr.js"></script>
+
+<!-- Then marks content as editable -->
+<div class="insertr" data-content-id="hero">
+  <h1>Your Editable Content</h1>
+</div>
+```
+
+**That's it!** Your clients can now edit this content inline.
+
+## 🎯 Three User Types
+
+### 1. **The Customer** (End User)
+- Sees a clean, professional website
+- No editing interface visible
+- Fast loading with minimal overhead
+
+### 2. **The Client** (Content Manager)  
+- Logs in to see the same website with subtle edit buttons
+- Clicks edit buttons to modify content inline
+- Can edit both simple text and rich markdown content
+- Changes are saved immediately
+
+### 3. **The Developer** (You)
+- Simple integration: just add `class="insertr"` 
+- No complex setup or framework dependencies
+- Works with any existing website
+
+## 🚀 Current Status
+
+**✅ Frontend Prototype Complete**
+- Working edit-in-place functionality
+- Mock authentication system
+- Local persistence
+- Multi-page support
+- Responsive design
+
+**🔄 In Development**
+- Go backend with REST API
+- Authentik OAuth integration
+- File-based content storage
+- Git version control
+
+## 🛠️ Quick Start
+
+1. **Clone and install**:
+   ```bash
+   git clone <repository-url>
+   cd insertr
+   npm install
+   ```
+
+2. **Start development server**:
+   ```bash
+   npm run dev
+   ```
+
+3. **Open http://localhost:3000** and test the demo!
+
+## 📖 Documentation
+
+- **[Development Guide](DEVELOPMENT.md)** - Setup, workflow, and contribution guide
+- **[Demo Instructions](demo-site/README.md)** - How to test the prototype
+- **[Project Planning](INITIAL.md)** - Requirements, research, and roadmap
+
+## 🏗️ Architecture
+
+### Current (Phase 1)
+- **Frontend**: Vanilla JavaScript + Alpine.js
+- **Storage**: localStorage (for prototype)
+- **Authentication**: Mock system
+- **Deployment**: Static files
+
+### Planned (Phase 2)
+- **Backend**: Go HTTP server
+- **Storage**: File-based with Git versioning  
+- **Authentication**: Authentik OAuth 2.0
+- **Deployment**: Single binary + static files
+
+### Future (Phase 3)
+- **Multi-tenant**: Host multiple client sites
+- **Admin Dashboard**: Advanced content management
+- **CDN Integration**: Global content delivery
+- **Plugin System**: Extensible functionality
+
+## 🎬 Demo Features
+
+**Try the prototype to see:**
+- ✏️ **Inline Editing** - Click edit buttons to modify content
+- 📝 **Rich Content** - Markdown editing for formatted text
+- 👤 **Authentication** - Login simulation with role switching
+- 💾 **Persistence** - Content saves automatically
+- 📱 **Responsive** - Works on desktop and mobile
+- 🔄 **Multi-page** - Consistent experience across pages
+
+## 🤝 Contributing
+
+This project is in active development. See [DEVELOPMENT.md](DEVELOPMENT.md) for:
+- Development setup
+- Project structure
+- Testing guidelines
+- Future roadmap
+
+## 📄 License
+
+MIT License - see LICENSE file for details.
+
+---
+
+**Built with ❤️ for small business websites and their developers**