Put admin credentials in description for now

CloudronManifest.json

@@ -1,7 +1,7 @@
 {
   "id": "io.gogs.cloudronapp",
   "title": "A self-hosted Git service",
-  "description": "easiest, fastest and most painless way to set up a self-hosted Git service",
+  "description": "easiest, fastest and most painless way to set up a self-hosted Git service.\nDefault credentials are admin:admin",
   "tagline": "painless self-hosted Git Service",
   "version": "0.0.1",
   "healthCheckPath": "/",