Adding the license tag

Hi!
I noticed that your model card mentioned that your model is Apache 2, would you be OK adding it to the metadata?
It will make your model more findable by people looking for open models!

README.md

@@ -1,5 +1,5 @@
 ---
-{}
+license: apache-2.0
 ---
 
 # XGen-7B-8K-Inst