docs: update README.md

data!: Remove duplicate books and add new ones

feat: do md5 deduplication for books, and shuffle

Update README.md

Update README.md

Update README.md

fix: Fix _split_generators

feat: add books with full volume of original text books; add clean, simplified chinese version, and filtered out bad lines datasets

Create README.md

fix: Fix split generators

feat: Initialized dataset information and collected 4363 ancient books from https://github.com/wenyuange

initial commit