Update file_settings.h

Author: gammasoft71

src/xtd.core/include/xtd/configuration/file_settings.h

@@ -24,6 +24,9 @@ namespace xtd {
     /// xtd.core
     /// @ingroup xtd_core configuration
     /// @remarks An [INI file](https://en.wikipedia.org/wiki/INI_file) is a configuration file that consists of a text-based content with a structure and syntax comprising key–value pairs for properties, and sections that organize the properties.
+    /// @par Examples
+    /// The following code example demonstrates the use of xtd::configuration::file_settings class.
+    /// @include file_settings.cpp
     class core_export_ file_settings : public object, public iequatable<file_settings> {
     public:
       /// @name Public Aliass