Added mailhog to service registry

registry/mailhog.json

@@ -0,0 +1,12 @@
+{
+  "$type": "service",
+  "name": "mailhog",
+  "description": "SMTP server that holds e-mail for debugging",
+  "tags": [ "app", "mail", "smtp" ],
+  "author": null,
+  "image": "mailhog/mailhog",
+  "ports": [
+    { "port": 1025, "info": "SMTP" },
+    { "port": 8025, "info": "HTTP" }
+  ]
+}