package it properly and add to dub?

[mw66]

https://code.dlang.org/

[quickfur]

Feel free to fork and add it. Or submit a PR.

Personally I have not much interest in adding this to dub, because it was written to be completely standalone; you can just copy fastcsv.d directly into your project directory and use it directly from there. No need for any of the packaging complexity for just a couple of functions in a single source file.