Minimal CI setup

Main changes:

• define script to run tests
• report coverage
• add dependencies
• fix typo on README

Suggestions:

Badges can be added (see this piece of doc) See my fork home page.

For e.g.:

• Pipeline status:
  • Badge: https://gitlab.utc.fr/%{project_path}/badges/%{default_branch}/pipeline.svg?style=flat-square
  • Link : https://gitlab.utc.fr/%{project_path}/pipelines
• Coverage report:
  • Badge: https://gitlab.utc.fr/%{project_path}/badges/%{default_branch}/coverage.svg?style=flat-square
  • Link : https://gitlab.utc.fr/%{project_path}/pipelines