gui: add basic gui code.

ClientCore/RemoteFile.h

@@ -0,0 +1,26 @@
+#ifndef REMOTE_FILE_H
+#define REMOTE_FILE_H
+
+#include <InfoMsg.h>
+#include <Util.h>
+
+#include "ClientCore.h"
+
+class RemoteFile : public DirFileHelper
+{
+public:
+    RemoteFile() = default;
+    ~RemoteFile() override = default;
+
+public:
+    void setClientCore(ClientCore* cliCore);
+
+public:
+    bool GetHome() override;
+    bool GetDirFile(const QString& dir) override;
+
+private:
+    ClientCore* cliCore_;
+};
+
+#endif   // REMOTE_FILE_H