Improve the example

examples/hello/main.cpp

@@ -16,6 +16,19 @@ int main()
     sheet->write("B3", 12345);
     sheet->write("C5", "=44+33");
     sheet->write("D7", true);
+
+    QXlsx::Worksheet *sheet2 = workbook.addWorksheet();
+    sheet2->write(0, 0, "First");
+    sheet2->write(1, 0, "Second");
+    sheet2->write(2, 0, "Third");
+    sheet2->write(3, 0, "Fourth");
+    sheet2->write(4, 0, "Total");
+    sheet2->write(0, 1, 100);
+    sheet2->write(1, 1, 200);
+    sheet2->write(2, 1, 300);
+    sheet2->write(3, 1, 400);
+    sheet2->write(4, 1, "=SUM(B1:B4)");
+
     workbook.save(DATA_PATH"Test.xlsx");
     workbook.save(DATA_PATH"Test.zip");
     return 0;