gui: Implement settings dialog

src/qt_gui/settings_dialog.h

@@ -0,0 +1,28 @@
+// SPDX-FileCopyrightText: Copyright 2024 shadPS4 Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include <QDialog>
+#include <QPushButton>
+
+#include "common/config.h"
+#include "common/path_util.h"
+
+namespace Ui {
+class SettingsDialog;
+}
+
+class SettingsDialog : public QDialog {
+    Q_OBJECT
+public:
+    explicit SettingsDialog(QWidget* parent = nullptr);
+    ~SettingsDialog();
+
+    int exec() override;
+
+private:
+    void LoadValuesFromConfig();
+
+    std::unique_ptr<Ui::SettingsDialog> ui;
+};