Add what's new dialog

custom_widgets/rounded_corners_dialog.h

@@ -0,0 +1,18 @@
+#ifndef ROUNDEDCORNERSDIALOG_H
+#define ROUNDEDCORNERSDIALOG_H
+
+#include <QDialog>
+
+namespace YACReader {
+class RoundedCornersDialog : public QDialog
+{
+    Q_OBJECT
+public:
+    explicit RoundedCornersDialog(QWidget *parent = nullptr);
+
+protected:
+    void paintEvent(QPaintEvent *) override;
+};
+}
+
+#endif // ROUNDEDCORNERSDIALOG_H