Adds an example project.

There!

What's the next step?  Clean OAIProvider.identify?  Add ListRecords/GetRecord (what I need most…)?
I don't know OAI-PMH well, so I'm a bit lost, but I'm still willing to help making a first complete version.

Also, have you found a clean and concise description of how OAI-PMH should be written?  All I can find is endless blah blah and monstruous examples…