Add author

CloudronManifest.json

@@ -1,6 +1,7 @@
 {
   "id": "org.wordpress.cloudronapp",
   "title": "WordPress",
+  "author": "WordPress developers",
   "description": "WordPress is web software you can use to create a beautiful website or blog. We like to say that WordPress is both free and priceless at the same time.",
   "tagline": "Code is Poetry",
   "version": "0.2.0",