chore: adjusted the project directory structure

app/aboutdialog.h

@@ -0,0 +1,32 @@
+#ifndef ABOUTDIALOG_H
+#define ABOUTDIALOG_H
+
+#include <QDialog>
+
+QT_BEGIN_NAMESPACE
+class QTextBrowser;
+class QTabWidget;
+class QDialogButtonBox;
+QT_END_NAMESPACE
+
+class AboutDialog : public QDialog
+{
+    Q_OBJECT
+public:
+    explicit AboutDialog(QWidget *parent = nullptr);
+    ~AboutDialog() override;
+
+    QSize sizeHint() const override;
+
+private:
+    QTabWidget * m_tabWidget = nullptr;
+    QDialogButtonBox * m_buttonBox = nullptr;
+
+    QTextBrowser * m_helpTextEdit = nullptr;
+    QTextBrowser * m_aboutTextEdit = nullptr;
+    QTextBrowser * m_specialThanksTextEdit = nullptr;
+    QTextBrowser * m_licenseTextEdit = nullptr;
+    QTextBrowser * m_3rdPartyLibsTextEdit = nullptr;
+};
+
+#endif // ABOUTDIALOG_H