Adding pipeline_tag and library_name

Adding pipeline_tag and library_name to increase discoverability and improve usage (it will enable the Use this model button :))

README.md

@@ -1,5 +1,7 @@
 ---
 license: apache-2.0
+pipeline_tag: text-generation
+library_name: transformers
 ---
 
 # Reka Flash 3.1