docs: further setting up structure

backend/src/schedule.cpp

@@ -1,2 +1,13 @@
 #include "schedule.h"
-#include "engine.h"
+#include "engine.h"
+
+void BookStoreBackEndClass::Run()
+{
+  std::string request_data;
+  while(true)
+  {
+    input_ptr->getline(request_data, '\n');
+    // std::string response_data = Engine::Process(request_data);
+    // output_ptr << response_data << '\n';
+  }
+}