Add https://chtyvo.org.ua/ to Trusted Book Providers

Chtyvo (Чтиво) is probably the biggest Ukrainian online-library.
Most books here are in Ukrainian, but some books in other languages are also included if they:
- were originally written in this language by Ukrainian classical author
- are important from the viewpoint of Ukrainian studies or history

A lot of Ukrainian authors, translators and scientists (mostly historians) publish their works here

If there are concerns about copyright, we can only link to works that are public domain in Ukraine (author died by 1th January 1953).

Site has:
64921 books (significant part of these pages are articles)
22176 authors (their author page has three sections: books written by this author, books translated by him, books about him or his works)