Adding CircleCI

[zaratan]

Why ?

As always when it comes to automatic testing, to protect ourself. CircleCi will run our test for us in "the cloud" for each pushed commit and prevent any pull-request to be merged if tests are not successful.

Must have

• [ ] A CircleCI config (v2)
• [ ] CircleCI must run rubocop and rspec (with coverage)
• [ ] Github should wait for CircleCI to run before allowing merging

Reading list

• https://circleci.com/docs/2.0/
• Example: https://github.com/denispasin/turtle_family/blob/master/.circleci/config.yml

[showner]

reading list/source: https://circleci.com/docs/2.0/language-ruby/

[zaratan]

https://circleci.com/docs/2.0/parallelism-faster-jobs/

[zaratan]

https://rubygems.org/gems/rspec_junit_formatter/versions/0.2.3