There is no persistent storage in the application by the time we're expecting
students to write ``Response`` handling functions. So add some more guidance
that we only expect placeholder values to be used, this wasn't sufficiently
clear. Fixes#3
Updated the latter placeholder values to match the guidance offered, for
consistency.
Updated the configuration ``helloMsg`` value and some of the tests to be a bit
more sensible, even if only a little.
Level 07 contains the addition of the ExceptT transformer for error handling in
the existing AppM from Level 06. Extends teh AppM to the DB layer.
Updated README with status
