added some code

wrote some code to test some functionallity

src/client_backend/queue_ctrl.h

@@ -0,0 +1,9 @@
+#pragma once
+#ifndef QUEUE_CTRL_H
+#define QUEUE_CTRL_H
+
+int queue_push(char* str);
+int queue_pop(char* str);
+int get_queue_size();
+
+#endif // !QUEUE_CTRL_H