Beginning to create the placeholder classes

server/client_manager.hpp

@@ -0,0 +1,23 @@
+#ifndef CLIENTMANAGER_HPP_
+#define CLIENTMANAGER_HPP_
+
+#include <list>
+
+class ClientManager {
+private:
+	ClientManager() = default;
+	~ClientManager() = default;
+	static ClientManager instance;
+
+public:
+	static ClientManager* GetInstance() { return &instance; }
+
+private:
+	struct ClientEntry {
+		int index;
+	};
+
+	std::list<ClientEntry> list;
+};
+
+#endif