adds the specs to the training guides repo

added the files to explain the spec basics. We
will follow using tox as it seems to be too much
overhead for little benefit for the volume of
spec requests the team is likely to get.

Implements blueprint training-guide-spec

Change-Id: I7ba685c94b375f1e1ef2f7203034ad2b86c0c748
Merge "adds the specs to the training guides repo"