Add Ember to "Error Tracking and Monitoring Services"

Ember allows to monitor your Caddy server in real time: per-host traffic, latency percentiles, status codes, and more. When FrankenPHP is detected, unlock per-thread introspection, worker management, and memory tracking.

This is the recommended way to monitor your FrankenPHP apps, see https://frankenphp.dev/docs/observability/.

README.md

 
 * [Blackfire](https://www.blackfire.io) - A low-overhead code profiler.
 * [BugSnag](https://www.bugsnag.com/) - Error and Real User Monitoring.
+* [Ember](https://github.com/alexandre-daubois/ember) - Real-time monitoring for Caddy & FrankenPHP
 * [Honeybadger](https://www.honeybadger.io/) - Error Tracking & Application Monitoring for Developers.
 * [Rollbar](https://rollbar.com/) - Error Logging & Tracking Service for Software Teams.
 * [Sentry](https://sentry.io/welcome/) - Application Performance Monitoring & Error Tracking Software.