feat(segment): add fortran (through gfortran)

[Silzinc]

Prerequisites

• [x] I have read and understood the [contributing guide][CONTRIBUTING.md].
• [x] The commit message follows the [conventional commits][cc] guidelines.
• [x] Tests for the changes have been added (for bug fixes / features).
• [ ] Docs have been added/updated (for bug fixes / features).

Description

Add Fortran support. Only works with the gfortran compiler (the most standard open-source one as far as I know, included in the gcc). I have to say I am not very comfortable with contributing to open source projects, so there might be things done wrong. I mostly recycled the Rust and Elixir segments to make this one.

[JanDeDobbeleer]

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[Silzinc]

Thank you for the reply. Edits should be allowed now. Also, I did try to add docs but I did not check the box as I did not know how to test them.