Added header with credits to model card

README.md

@@ -5,7 +5,9 @@ library_name: exllamav2
 base_model:
 - ibm-granite/granite-guardian-3.2-5b
 ---
-# Granite Guardian 3.2 5B
+# granite-guardian-3.2-5b-exl2
+Original model: [granite-guardian-3.2-5b](https://huggingface.co/ibm-granite/granite-guardian-3.2-5b)  
+Created by: [IBM Research](https://huggingface.co/ibm-granite)
 
 ## Quants
 [4bpw h6 (main)](https://huggingface.co/cgus/granite-guardian-3.2-5b-exl2/tree/main)