make
'stops' method in station class that will create a join table for lines and stations.
make 'stops' method in line class that will create a join table for lines and stations.
fix README.md header.
make main_menu for UI
make lines_menu for UI for user to choose to add_line or list_lines.
create an add_line method in UI so that user can make and save a train line.
create a list_lines method in UI for user to list the lines they've created.
create stations menu so that user can decide to add/list station
create add station method so that user can add/save station to the stations table
fix indentation on UI.
create list_stations method so that user can see a list of the stations they have inputted.
make code for methods that still need work