Add RDF usage examples

[tucotuco]

See some examples at:

https://code.google.com/p/tdwg-rdf/wiki/DwcRdfOccurrences

Where should these live? All on the README.md, or in the Wiki? If the former, we will need a good Table of Contents.

[tucotuco]

From Steve Baskauf on tdwg-content (http://lists.tdwg.org/pipermail/tdwg-content/2014-December/003403.html).

"Perhaps a good strategy would be to create a stable landing page for all of the ancillary RDF Guide documents at Github. Then references in the guide can point to that page, rather than to a number of individual pages whose URLs might be more likely to change. Does that sound like a good idea?"

[ramorrismorris]

Yes it sounds like a good idea, especially if it is convenient and stable for examples to point back to fragments in the Guide. When I read examples of something compliant to a spec or guidance, my most frequent head scratching starts in the example at a point where I ask myself "Why the heck are they doing it that way?" That's when I have to go back to the authority document, praying that I've landed in the right place.

[tucotuco]

This issue has had an apparent lack of demand for a very long time. Closing.