Add pipeline tag and library name

This PR adds a pipeline tag, enabling the model to be found at https://huggingface.co/models?pipeline_tag=text-generation.
It also adds `library_name: transformers`.

README.md

@@ -1,5 +1,7 @@
 ---
 license: apache-2.0
+pipeline_tag: text-generation
+library_name: transformers
 ---
 
 # 🧨 FLAME-MoE