Add a new example

examples/xlsx/extractdata/doc/src/extractdata.qdoc

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+/*!
+    \example extractdata
+    \title Extract Data Example
+    \brief This is a simplest Qt Xlsx example.
+    \ingroup qtxlsx-examples
+
+    This example demonstrates how to extract data form existing
+     .xlsx file with Qt Xlsx Library. So lets see how this is achieved.
+
+    This creates a new instance of the all important Document
+    class which gives you access to the Excel workbook and worksheets.
+    \snippet hello/main.cpp 0
+
+    Extracts data from current worksheet.
+    \snippet hello/main.cpp 1
+*/

examples/xlsx/extractdata/extractdata.pro

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+TARGET = extractdata
+
+#include(../../../src/xlsx/qtxlsx.pri)
+QT+=xlsx
+
+CONFIG   += console
+CONFIG   -= app_bundle
+
+SOURCES += main.cpp

examples/xlsx/extractdata/main.cpp

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+#include <QtCore>
+#include "xlsxdocument.h"
+
+int main()
+{
+    {
+    //Create a new .xlsx file.
+    QXlsx::Document xlsx;
+    xlsx.write("A1", "Hello Qt!");
+    xlsx.write("A2", 12345);
+    xlsx.write("A3", "=44+33");
+    xlsx.write("A4", true);
+    xlsx.write("A5", "http://qt-project.org");
+    xlsx.saveAs("Book1.xlsx");
+    }
+
+    //![0]
+    QXlsx::Document xlsx("Book1.xlsx");
+    //![0]
+
+    //![1]
+    qDebug()<<xlsx.read("A1");
+    qDebug()<<xlsx.read("A2");
+    qDebug()<<xlsx.read("A3");
+    qDebug()<<xlsx.read("A4");
+    qDebug()<<xlsx.read("A5");
+    //![1]
+
+    return 0;
+}