[Feature Request] Add Salad Transcription API

[kpalik]

https://salad.com/transcription

it is very cheap and accurate API

i can try to help with adding this if you accept pull requests

ok i've done it in my fork, https://github.com/kpalik/NeuroVoxSalad

commit - kpalik@7fc3bdb

[kpalik]

added a PR here #22