fix: top4-balanced

fix: revert README

fix: configs

fix: features for configs

fix: renaming config names

fix: renaming config top4 to top4-balanced

fix: removing train/test split (leaving this responsiblity to the data loader)

Merge branch 'main' of hf.co:datasets/contemmcm/ag_news

feat: config top4

Librarian Bot: Add language metadata for dataset (#2)

fix: metadata features defintion

Create README.md