Add fs2-data-csv to the toolkit

[zetashift]

Should we add the generic module as well?

• https://mvnrepository.com/artifact/org.gnieh/fs2-data-csv-generic_2.13
• https://fs2-data.gnieh.org/documentation/csv/generic/

[TonioGela]

Should we add the generic module as well?

* https://mvnrepository.com/artifact/org.gnieh/fs2-data-csv-generic_2.13

* https://fs2-data.gnieh.org/documentation/csv/generic/

We totally can! You can add it to the Pull Request :)

[armanbilge]

Oh, we should update the README too :)