1. Added empty spec spec/calendar_spec.rb for a top-level class Calendar defined in calendar.rb representing the Calendar

2. Added .rspec file in the root of the project. RSpec conventionally reads the command line configuration options supported by it from this file for given project.

Reference: https://www.relishapp.com/rspec/rspec-core/v/2-4/docs/configuration/read-command-line-configuration-options-from-files