Add WarningDialog
diff --git a/src/warningdialog.h b/src/warningdialog.h
new file mode 100644
index 0000000..7b3125a
--- /dev/null
+++ b/src/warningdialog.h
@@ -0,0 +1,22 @@
+#ifndef WARNINGDIALOG_H
+#define WARNINGDIALOG_H
+
+#include <QDialog>
+
+namespace Ui {
+class WarningDialog;
+}
+
+class WarningDialog : public QDialog
+{
+    Q_OBJECT
+
+public:
+    explicit WarningDialog(QWidget *parent = 0);
+    ~WarningDialog();
+
+private:
+    Ui::WarningDialog *ui;
+};
+
+#endif // WARNINGDIALOG_H