Created a model that is used for accessing a corresponding database table.
When a model is created wit the rails console, a database migration file is also generated.
This file can be used to create an actual database, which can be an sqlite, oracle, or other databases.
Its possible to interact with the database via the rails console ('rails c' on terminal).
Three database entries have been created in this exercise. Each instanciation could be done using ruby
source code and not database specific queries.