added rails-api gem and changed sqlite to postgres db
changed application controller to inherit from ActionController::API and removed protect_from_forgery
added boat migration, model and controller
added timeslots migration, model and controller
added assignment migration, model and controller
added booking migration, model and controller
added associations to models
added api namespace, and the create and index routes for boats
added logic for the boats controller create method
added logic for index method in boats controller
added testing gems to gemfile
created spec folder structure