Merge pull request #4369 from dominovd/master

Add isitdownstatus.com to Monitoring section

README.md

@@ -756,6 +756,7 @@ This list results from Pull Requests, reviews, ideas, and work done by 1600+ peo
   * [incidenthub.cloud](https://incidenthub.cloud/) - Cloud and SaaS status page aggregator - 20 monitors and 2 notification channels (Slack and Discord) are free forever.
   * [inspector.dev](https://www.inspector.dev) - A complete Real-Time monitoring dashboard in less than one minute with a free forever tier.
   * [instatus.com](https://instatus.com) - Get a beautiful status page in 10 seconds. Free forever with unlimited subs and unlimited teams.
+    * [isitdownstatus.com](https://isitdownstatus.com) – Free public JSON API returning real-time status for 500+ popular services (GitHub, Stripe, AWS, etc.). No auth required, CORS enabled.
   * [linkok.com](https://linkok.com) - Online broken link checker, free for small websites up to 100 pages, completely free for open-source projects.
   * [loader.io](https://loader.io/) - Free load testing tools with limitations
   * [Middleware.io](https://middleware.io/) -  Middleware observability platform provides complete visibility into your apps & stack, so you can monitor & diagnose issues at scale. They have a free forever plan for Dev community use that allows Log monitoring for up to 1M log events, Infrastructure monitoring & APM for up to 2 hosts.