Annotates kana symbols with their romanizations.
$ stack exec -- niwatori-exe "にわとり"
にわとり niwatori (にni わwa とto りri)
$ stack exec -- niwatori-exe --json "にわとり"
[{"romaji":"niwatori","kana":"にわとり","characters":[{"romaji":"ni","kana":"に"},{"romaji":"wa","kana":"わ"},{"romaji":"to","kana":"と"},{"romaji":"ri","kana":"り"}]}]