Add Gatus to the list of status pages.

README.md

@@ -1806,6 +1806,7 @@ _See also: [awesome-sysadmin/Code Review](https://github.com/awesome-foss/awesom
 - [cState](https://github.com/cstate/cstate) - Static status page for hyperfast Hugo. Clean design, minimal JS, super light HTML/CSS, high customization, optional admin panel, read-only API, IE8+. Best used with Netlify, Docker. ([Demo](https://cstate.mnts.lt/)) `MIT` `Go`
 - [s.Status](https://github.com/scolastico-dev/s.Status) - s.Status is a open source server status page written in java. `MPL-2.0` `Java`
 - [Uptime Kuma](https://github.com/louislam/uptime-kuma) - A self-hosted website monitoring tool like "Uptime Robot". ([Demo](https://demo.uptime.kuma.pet)) `MIT` `Nodejs`
+- [Gatus](https://github.com/TwiN/gatus) - An open source status page written in go. In addition to a simple status dashboard, Gatus also supports alerting to a variety of destinations, and has a REST API. Also available as a [paid SaaS product](https://gatus.io/).
 
 
 ### Task Management & To-do Lists