add the field status for the timeslots and update the gen.timeslot commands

[rodolforpr88]

• app/commands/generate_timeslots_commands add the reader for status and update the creates adding the status attribute for it
• app/models/timeslot add new field status type enum and add validation for it
• app/services/timeslot_service update the instance adding the attribute status
• spec/*update the tests 'commands/generate_timeslots_commands', 'factory/timeslots' and 'app/models/timeslot' adding the new field 'status'"

Rspec Screenshot

observation.: the failed test was solved in the branch #13