Added Building class
Added name keyword argument & instance variable to Building class
Added apartments as 'getter' and instance variable to Building class
Fixed address and apartment instance variables, successfully tested
Added method to add apts
Fixed apartments instance variable to make it a Hash
Added Tenant class and successfully tested new instance
Updated add_apts method in Building class and tested it
Added method to calculate credit rating to Tenant class & tested successfully
Added apartment class and successfully tested it
Added method to add tenants to apartment and successfully tested it
Added credit_rating method to apartment file, but not working exactly how I want, so commented out for now
Added method to remove tentants from apt file by name or by index
Added method to remove all tenants from apartment file
Trying to change add_tenant method to Hash + trying to define avg_credit_score method