API-work for kassa.neuf.no

* Starts /api/register.php as primary endpoint for kassa
* Started work on simple card number updates in cardnumber.php
* Reworded sms/register.php
* Update README with markdown syntax

snapporder/api/query.php

@@ -87,6 +87,4 @@ if($user['registration_status'] === "partial") {
 
 /* Return encrypted user object */
 echo $crypt->json_encode_and_encrypt($user);
-//echo json_encode($user);
-
-?>
+//echo json_encode($user);