As a ProgrammableThermostat, I want to store the temperature settings that a user has entered for a given day and time so that they can be retrieved and changed at a later time.

Acceptance Criteria:

• Ability to save one or more entered (programmed) temperature settings to file management.  

• Ability to retrieve one or more entered (programmed) temperature settings from a file.

Acceptance Testing:

• A ProgrammableThermostat can save programmed temperature settings to a given file.

• ProgrammableThermostat can retrieve programmed temperature settings from a given file.

• ProgrammableThermostat must support various non-successful scenarios such as file not found.

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