Add Caddy server configuration for domain markov.elpatron.me with Let's Encrypt SSL and WebSocket support. Includes: - Caddy service in docker-compose.yml - Caddyfile with SSL and WebSocket configuration - Enhanced Flask app for proxy compatibility - Documentation files (CADDY.md, updated README.md)

CADDY.md

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+# Caddy Server Configuration
+
+This project uses Caddy as a reverse proxy to handle SSL termination with Let's Encrypt and WebSocket support for the domain `markov.elpatron.me`.
+
+## Configuration
+
+The Caddy configuration is defined in the [Caddyfile](Caddyfile) and includes:
+
+1. Automatic SSL certificate management with Let's Encrypt
+2. Reverse proxy to the Flask application
+3. Proper WebSocket support for real-time updates
+4. Proxy header forwarding for client IP and protocol information
+
+## Setup Instructions
+
+1. Update the email address in the [Caddyfile](Caddyfile) to your actual email for Let's Encrypt notifications:
+   ```
+   markov.elpatron.me {
+       tls your-email@example.com
+       # ... rest of configuration
+   }
+   ```
+
+2. Ensure your DNS is properly configured to point `markov.elpatron.me` to your server's IP address.
+
+3. Start the services with Docker Compose:
+   ```bash
+   docker-compose up -d
+   ```
+
+## How It Works
+
+- Caddy automatically obtains and renews SSL certificates from Let's Encrypt
+- All HTTP traffic is automatically redirected to HTTPS
+- WebSocket connections are properly handled and forwarded to the Flask-SocketIO application
+- Proxy headers are forwarded to preserve client IP and protocol information
+
+## WebSocket Support
+
+The configuration includes specific handling for WebSocket upgrade requests to ensure real-time features work correctly:
+
+```
+@websockets {
+    header Connection *Upgrade*
+    header Upgrade websocket
+}
+```
+
+This ensures that SocketIO connections can be established and maintained properly through the proxy.