Add support for Nim (was: Comments in Nim are in the wrong format)

Unless I misunderstood your API, results should have comments in the syntax of the desired language.

In the case of Nim, comments are Python-like (#), but results come in C format (/**/).

Reproduce a cheat sheet result for Nim and inspect where result comments are formatted. Confirm that generated comments use Nim's # syntax rather than C-style /**/; the issue is complete when Nim results consistently use the expected comment format.

Written by the indexing model from the issue text.