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` (c63ed77ac30728faa3e1e0c8851b5cf654b3eb23)


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

README.md

@@ -1,3 +1,6 @@
+---
+pipeline_tag: text-ranking
+---
 Quantization made by Richard Erkhov.
 
 [Github](https://github.com/RichardErkhov)