Add a reminder email template for student accounts

1-email

+Hi {$realname},
+
+Your Swansea University Computer Society account ({$username}) is up for renewal, this costs just £5 for the academic year.
+
+You can renew by simply buying membership at https://sucs.org/join.
+
+Faliure to do so will result in your account being deleted.
+
+If you believe you have already paid for this year please let us know ASAP.
+
+If you are no longer a student at Swansea University you can now join SUCS as an Alumni member for £20 a year.
+
+--
+Sent by {$adminname}
+Swansea University Computer Society
+https://sucs.org/
+