Update model metadata to set pipeline tag to the new `text-ranking` and tags to `sentence-transformers`

README.md

@@ -4,6 +4,8 @@ license: apache-2.0
 base_model: bert-base-uncased
 tags:
 - generated_from_trainer
+- sentence-transformers
+pipeline_tag: text-ranking
 model-index:
 - name: bert-reg-crossencoder-mae
   results: []