Update model metadata to set pipeline tag to the new `text-ranking` (#1)

- Update model metadata to set pipeline tag to the new `text-ranking` (1768abee956d45341a92b759bf7cd9dafe94f485)


Co-authored-by: Tom Aarsen <tomaarsen@users.noreply.huggingface.co>

README.md

@@ -5,6 +5,7 @@ language:
 - pt
 base_model:
 - TucanoBR/Tucano-160m
+pipeline_tag: text-ranking
 ---
 
 ```python