Add csv parsing

[ArchibaldBienetre]

See #10: Re-created #3

---

Implements https://github.com/DonMischo/csv2tex/issues/4

TODOs

• [x] @ArchibaldBienetre : Add learning test
• [x] @ArchibaldBienetre : Add failing test for actual implementation (TDD)
• [ ] @DonMischo : Implement actual CSV parsing
• [ ] @DonMischo : check out the numerous comments that @ArchibaldBienetre writes in this and the past pull requests like #3 espacially so that you have a decent chance to catch up at 3h a week spent on this task
• [x] wait for https://github.com/DonMischo/csv2tex/pull/2 to get merged, then rebase pull request

[ArchibaldBienetre]

assumed input format is wrong, cf

https://github.com/DonMischo/csv2tex/issues/16#issuecomment-944904627

[ArchibaldBienetre]

https://github.com/SergelsOrg/csv2tex/pull/30