/*!
    \title Xlsx Readwrite Example
    \example readwrite
    \brief Open an existing xlsx file, modify and save it.
    \ingroup qtxlsx-examples

    This example demonstrates how to modify an existing
    .xlsx file with Qt Xlsx Library.

    \image readwrite.png

    At first, we create an empty xlsx file, set the properties of the document,
    write some content to the worksheet, then save it.    
    \snippet readwrite/main.cpp 0

    Then we open the exists xlsx file, add some data to it.
    \snippet readwrite/main.cpp 1
*/