implementation of registration (not finished)

src/session.c

@@ -162,6 +162,9 @@ void perform_session_action(session *sess, char *line, server_data_t *s_d) {
       process_client_command(line, sess, s_d);
     }
     break;
+  case OP_REGISTER:
+    // TODO: 
+    break;
   }
   /* } */
 }