New Description def and usage

Added common Description class for details/simple.
All classes will use Description instead of their own strings.
Added .gitattributes
Added Item class
Rooms and RoomIO stubs and pseudocode

Moving towards just being able to bring an XML file of Room objects into
the Rooms collection.
TestData/TwoRooms edits

Can now go over to the WR's curtains. Changed what is seen outside the
window, based on Melissa's suggestion.