Add authenticated documentation server

- Created docs_server.py with HTTP basic authentication
- Added start-docs-server.sh for easy startup
- Updated README.md with documentation access instructions
- Provides working authentication when .htaccess isn't supported

Usage: ./start-docs-server.sh [port]
Credentials: langmem / langmem2025

🤖 Generated with [Claude Code](https://claude.ai/code)

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

README.md

@@ -18,6 +18,7 @@ LangMem uses a hybrid approach combining:
 - 📊 **Rich Metadata**: Flexible memory attributes
 - 🔒 **Secure API**: Bearer token authentication
 - 🐳 **Docker Ready**: Containerized deployment
+- 📚 **Protected Documentation**: Basic auth-protected docs
 - 🧪 **Comprehensive Tests**: Unit and integration tests
 
 ## Quick Start
@@ -278,6 +279,44 @@ For production deployment:
 4. Set up monitoring and logging
 5. Configure backup procedures
 
+## Documentation
+
+The LangMem project includes comprehensive documentation with authentication protection.
+
+### Accessing Documentation
+
+Start the authenticated documentation server:
+
+```bash
+# Start documentation server on port 8080 (default)
+./start-docs-server.sh
+
+# Or specify a custom port
+./start-docs-server.sh 8090
+```
+
+**Access Credentials:**
+- **Username:** `langmem`
+- **Password:** `langmem2025`
+
+**Available Documentation:**
+- 📖 **Main Docs**: System overview and features
+- 🏗️ **Architecture**: Detailed system architecture  
+- 📡 **API Reference**: Complete API documentation
+- 🛠️ **Implementation**: Step-by-step setup guide
+
+### Direct Server Usage
+
+You can also run the documentation server directly:
+
+```bash
+python3 docs_server.py [port]
+```
+
+Then visit: `http://localhost:8080` (or your specified port)
+
+Your browser will prompt for authentication credentials.
+
 ## Contributing
 
 1. Fork the repository