Update README.md

docs: add Data Formats section (raw/parquet/tsv) and TSV to structure

Point both configs to parquet/ (default=train+test, benchmark=test)

Order benchmark (parquet) config first so datasets infers the parquet builder

Add benchmark config (image-embedded parquet) to dataset card

Update README.md

Update README.md

Update README.md

Add files using upload-large-folder tool