Changes proposed in this pull request:

• sort make targets
• replace short options by long options
• add target to generate README file

How to test the feature manually:

1. in a terminal, launch make.
2. validate that the targets are sorted.
3. launch make with a target.
4. validate that the target still works.
5. launch make with the readme target.
6. validate that the README file is updated.

Pull request checklist:

• clear commit messages
• code manually tested
• unit tests written (optional if too hard)
• documentation updated

Additional information can be found in the documentation.