Add support for cornish

[cousquer]

Is your feature request related to a problem? Please describe.
🍭 Add support for cornish kw = "kernewek"

Describe the solution you'd like
"C'est là que cela se complique..."
Ref.: cornish

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context
Tribune to Drew Wills