qt_test: add qt test example package

Signed-off-by: Andy Hu <andy.hu@starfivetech.com>

package/starfive/qt_test/src/mainwindow.h

@@ -0,0 +1,25 @@
+#ifndef MAINWINDOW_H
+#define MAINWINDOW_H
+
+#include <QMainWindow>
+
+QT_BEGIN_NAMESPACE
+namespace Ui { class MainWindow; }
+QT_END_NAMESPACE
+
+class MainWindow : public QMainWindow
+{
+    Q_OBJECT
+
+public:
+    MainWindow(QWidget *parent = nullptr);
+    ~MainWindow();
+
+private:
+    Ui::MainWindow *ui;
+
+private slots:
+    void on_pushButton1_clicked();
+
+};
+#endif // MAINWINDOW_H