Update README.md

Update README.md

Change entity_to_token to list-of-objects schema; update README accordingly

Normalize entity_to_token schema (0..19) and document split groups; update human_train, human_test, synthetic_train

Normalize entity_to_token schema (0..19) and document split groups; update human_train, human_test, synthetic_train

dataset release v1.0

Update README.md

Update README.md

initial commit