add StateMachine

include/client/ClientState.h

@@ -0,0 +1,20 @@
+#pragma once
+
+#include <client/Client.h>
+#include <td/misc/SlotGuard.h>
+
+namespace td {
+namespace client {
+
+class ClientState : public Client::State, private utils::SlotGuard {
+  public:
+	ClientState(Client& a_Client);
+	virtual ~ClientState() {}
+
+  protected:
+	void SendPacket(const protocol::PacketBase& a_Packet);
+	virtual void HandlePacket(const protocol::PacketBase& a_Packet) {}
+};
+
+}  // namespace server
+}  // namespace td