docs: Added CMDN to list of companies using NestJS

Author: dmitry-zaets

content/discover/who-uses.json

@@ -170,6 +170,7 @@
     "https://aqreach.com",
     "https://phalco.de",
     "https://www.tesseractpro.io",
-    "https://www.kwanso.com"
+    "https://www.kwanso.com",
+    "https://cmdn.io"
   ]
 }