Add Rspec

[C83]

Why ?

We need a test framework right away. This way, rails will generate the different files correctly. I'd rather like Rspec as its syntax is more readable and the tests look good.

Must have:

• [x] rspec-rails
• [x] Install rspec in the app (rails generate rspec:install)
• [x] basic .rspec config must include rails_helper by default

Reading List

• Short videos about rspec: http://rspec.info/
• Getting started: https://relishapp.com/rspec/docs/gettingstarted
• List of matchers: https://relishapp.com/rspec/rspec-expectations/v/3-7/docs/built-in-matchers
• Hooks: https://relishapp.com/rspec/rspec-core/v/3-7/docs/hooks/before-and-after-hooks
• Rspec subject: https://relishapp.com/rspec/rspec-core/v/3-7/docs/subject/explicit-subject

[C83]

Third point : In .rpsec :

• `--color`` to use color in the result
• --require rails_helper to load rails_helper

[C83]

10 ok