use ESM, add server setup, cleanup

Change-Id: Iafac35c2082523ae98c31017d9bad5c4d6e18ef3
diff --git a/model/Contact.js b/model/Contact.js
index 9d00098..8fa26b2 100644
--- a/model/Contact.js
+++ b/model/Contact.js
@@ -30,4 +30,4 @@
     }
 }
 
-module.exports = Contact;
+export default Contact