Add catches_strings test to test throws char * typemap

Examples/test-suite/csharp/catches_strings_runme.cs

@@ -0,0 +1,20 @@
+using System;
+using catches_stringsNamespace;
+
+public class catches_strings_runme {
+  public static void Main()
+  {
+    {
+      bool exception_thrown = false;
+      try {
+        StringsThrower.charstring();
+      } catch (ApplicationException e) {
+        if (!e.Message.Contains("charstring message"))
+          throw new ApplicationException("incorrect exception message:" + e);
+        exception_thrown = true;
+      }
+      if (!exception_thrown)
+        throw new ApplicationException("Should have thrown an exception");
+    }
+  }
+}