Add pipeline tag

This PR ensures the model can be found at https://huggingface.co/models?pipeline_tag=feature-extraction.

README.md

@@ -1,6 +1,7 @@
 ---
 library_name: transformers
 license: mit
+pipeline_tag: feature-extraction
 ---
 
 # Model Card for GERM
@@ -61,4 +62,4 @@ GLUE
       primaryClass={cs.LG},
       url={https://arxiv.org/abs/2505.00598}, 
 }
-```
+```