Rewrite dataset card to match KDD v2 contents (T1/T2/T4/T5/T6)

Upload data/t6/validation.jsonl (1225 rows)

Upload data/t6/train.jsonl (766 rows)

Upload data/t6/test.jsonl (2592 rows)

Upload data/t5/validation.jsonl (692 rows)

Upload data/t5/train.jsonl (889 rows)

Upload data/t5/test.jsonl (1761 rows)

Upload data/t4/validation.jsonl (2268 rows)

Upload data/t4/train.jsonl (2875 rows)

Upload data/t4/test.jsonl (5791 rows)

Upload data/t2/t2_val.jsonl (2500 rows)

Upload data/t2/t2_train.jsonl (543 rows)

Upload data/t2/t2_test.jsonl (2500 rows)

Upload data/t1/train.jsonl (709 rows)

Upload data/t1/test.jsonl (275 rows)

Add dataset loading script (KDD v2 URL map)

Add dataset card README

initial commit