IDL4CPP — Add Example Transformation

Not sure where (not necessarily in the noted paragraph) should include a reference to an electronic mapping file as an example. Could also include test sample IDL and corresponding C++ output. This should probably be informational and could also be in an Annex. The key reason is to show the actual transformation as well as a test/verification of the mappings. Perhaps also include versions of tools/compiler used in which the transformations were validated. In addition unit tests could be referenced or included as informative content to the spec.