Update README.md with license information (#2)

- Update README.md with license information (9621ca77698e864aa1484054fd7171241bbe6c5b)


Co-authored-by: Chen Chongyu <mir123321@users.noreply.huggingface.co>

README.md

@@ -1,3 +1,5 @@
+license: apache-2.0
+
 ---
 license: llama2
 ---