Add base model metadata to model card

It would be nice to trace the genealogy of merged models like this: https://colab.research.google.com/drive/1s2eQlolcI1VGgDhqWIANfkfKvcKrMyNr?usp=sharing

README.md

@@ -2,6 +2,9 @@
 license: apache-2.0
 language:
 - en
+base_model:
+- viethq188/LeoScorpius-7B-Chat-DPO
+- GreenNode/GreenNodeLM-7B-v1olet
 ---
 
 # WARNING