Added graph and search methods
Changed GetCurrentLocation to point towards next node in a path
the button now calculates a path towards the point in edgeto method
Added graph.txt which holds some vertices and edges (not very many)

The search and path building functions work but I dont have a GPS device
so will need help with practical testing there aren't that many points
to work with yet but there should be a line of them between the 152
class room and the junction between family food and science building and
the professional/human services building.