added class mxDatabase; store credentials; implement login.php

config.sample.php

@@ -2,7 +2,6 @@
 $homeserver = "example.com";
 $access_token = "To be used for sending the registration notification";
 $register_room = '$registerRoomID:example.com';
-$registration_shared_secret = "To be used for actually register the user";
 
 $webroot="https://myregisterdomain.net/";
 $howToURL = "https://my-url-for-storing-howTos.net";