Add link to Github repository

This PR adds a link to the Github repository for the Samba model, as mentioned in the paper. This makes it easier for users to access the training code.

README.md

@@ -1,10 +1,10 @@
 ---
-license: apache-2.0
 language:
 - en
 - ja
-pipeline_tag: text-generation
 library_name: transformers
+license: apache-2.0
+pipeline_tag: text-generation
 ---
 
 # PLaMo 2 1B
@@ -111,3 +111,8 @@ This model is trained under the project, “Research and Development Project of
 
 - (EN) https://www.preferred.jp/en/company/aipolicy/
 - (JA) https://www.preferred.jp/ja/company/aipolicy/
+
+
+## Codebase
+
+Training code is available at: https://github.com/microsoft/Samba