Update debug README.md

Author: szepeviktor

debug/README.md

@@ -3,4 +3,7 @@
 See [debug-wordpress][debug-wordpress]
 for tools and techniques for debugging WordPress.
 
+- Debug AJAX requests: https://github.com/szepeviktor/qm-ajax
+- Debug OPcache status: https://github.com/szepeviktor/qm-opcache-status
+
 [debug-wordpress]: https://github.com/szepeviktor/debug-wordpress