Started rewriting the new version

json_sms.php already reflects that. The old class files are still around, though.

src/SmsGateway/Backend/DatabaseBackend.php

@@ -0,0 +1,8 @@
+<?php
+namespace SmsGateway\Backend;
+
+use SmsGateway\BackendInterface;
+
+class DatabaseBackend implements BackendInterface
+{
+}