reformat metadata and reorg ckp path

README.md

@@ -105,7 +105,7 @@ To reduce the discrepancy between training and inference, we propose iterative i
 ```python
 from modules.listconranker import ListConRanker
 
-reranker = ListConRanker('./ListConRanker_ckpt', use_fp16=True, list_transformer_layer=2)
+reranker = ListConRanker('./', use_fp16=True, list_transformer_layer=2)
 
 # [query, passages_1, passage_2, ..., passage_n]
 batch = [