Add data validation read/write support

examples/xlsx/datavalidation/datavalidation.pro

@@ -0,0 +1,9 @@
+TARGET = datavalidation
+
+#include(../../../src/xlsx/qtxlsx.pri)
+QT+=xlsx
+
+CONFIG   += console
+CONFIG   -= app_bundle
+
+SOURCES += main.cpp

examples/xlsx/datavalidation/main.cpp

@@ -0,0 +1,22 @@
+#include <QtCore>
+#include "xlsxdocument.h"
+#include "xlsxdatavalidation.h"
+
+QTXLSX_USE_NAMESPACE
+
+int main()
+{
+    Document xlsx;
+    xlsx.write("A1", "A2 and A3:E5 only accept the number between 33 and 99");
+
+    //![1]
+    DataValidation validation(DataValidation::Whole, DataValidation::Between, "33", "99");
+    validation.addRange("A2");
+    validation.addRange("A3:E5");
+    validation.setPromptMessage("Please Input Integer between 33 and 99");
+    xlsx.addDataValidation(validation);
+    //![1]
+
+    xlsx.save();
+    return 0;
+}

examples/xlsx/xlsx.pro

@@ -5,5 +5,6 @@ SUBDIRS = hello style \
     mergecells \
     rowcolumn \
     numberformat \
-    readwrite
+    readwrite \
+    datavalidation