Add example

Polygon_repair/doc/Polygon_repair/examples.txt

@@ -1,3 +1,4 @@
 /*!
 \example Polygon_repair/repair_polygon_2.cpp
+\example Polygon_repair/repair_multipolygon_2.cpp
 */

Polygon_repair/examples/Polygon_repair/repair_multipolygon_2.cpp

@@ -0,0 +1,23 @@
+#include <iostream>
+#include <fstream>
+
+#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
+#include <CGAL/Polygon_repair/repair.h>
+#include <CGAL/IO/WKT.h>
+
+using Kernel = CGAL::Exact_predicates_inexact_constructions_kernel;
+using Point_2 = Kernel::Point_2;
+using Polygon_2 = CGAL::Polygon_2<Kernel>;
+using Multipolygon_with_holes_2 = CGAL::Multipolygon_with_holes_2<Kernel>;
+
+int main(int argc, char* argv[])
+{
+  std::ifstream in((argc > 1) ? argv[1] : CGAL::data_file_path("wkt/issue.wkt"));
+  Multipolygon_with_holes_2 pin;
+  CGAL::IO::read_multi_polygon_WKT(in, pin);
+
+  Multipolygon_with_holes_2 mp = CGAL::Polygon_repair::repair(pin);
+  CGAL::IO::write_multi_polygon_WKT(std::cout, mp);
+
+  return 0;
+}