updated ReadMe
restarting from the beginning
should not be broken after we create it
should be able to break
should be able to get fixed
refactoring
Docking Station should accept a bike
Docking Station  should release a bike
Docking Station should know when it's full
should not accept a bike if it's full + refactoring
Docking Stations hould provide the list of available bikes
Van should accept a bike
Van should know when it's full
van
Garage can accept broken bikes
Garaga should release bikes when fixed
garage knows when it's full
raise an error if garage is full
added bike_container module