Add more domain logic
Add properties to IAppointment - PhoneNumber, StartTime, EndTime, Location
Add contructor to Appointment class.
Add property to Appointment class - Location
Add methods to Availability class - FetchAppointment
Add methods to Schedule class - FetchAppointments, FetchAppointments
Add DeleteSchedule, DeleteAvailability, DeleteAppointmentTemporal to Facade class.
Correct spelling for FetchAvailability and CreateAvailability.