Add ReLoop GitHub badge

Add badges for arXiv, GitHub, and license

Update paper title, citation, and arXiv link

Refine F6 tolerance: 1% for pack_size and fixed_order only

Clarify rationale for prompt format roles

Update dataset card: F6 tolerance, NL4Opt count, prompt format roles

Fix non-ASCII characters in descriptions

Initial release: RetailOpt-190 benchmark dataset

initial commit