Enhance README with native Docker health checks for server monitoring

Author: jaydrogers

README.md

@@ -29,6 +29,7 @@ The image is based on `certbot/dns-cloudflare:latest`, providing a stable and up
 - Customizable configuration via environment variables
 - Periodic certificate renewal checks
 - Windows support (set `REPLACE_SYMLINKS` to `true`)
+- Native Docker health checks to ensure the server is running
 
 ## Environment Variables