Add library name tag, link to Github repository

This PR adds the `library_name` tag, to ensure users can quickly find a way to use the model.
It also adds a link to the Github repository.

README.md

@@ -1,6 +1,7 @@
 ---
 license: apache-2.0
 pipeline_tag: text-generation
+library_name: transformers
 ---
 
 # 🧨 FLAME-MoE