Update README.md

Added prompt structure

README.md

@@ -27,6 +27,14 @@ It has been fine-tuned for instruction following using the OpenOrca dataset and
 
 This model is intended to evaluate fine-tuning results on mamba models.
 
+## Usage
+
+### Prompt structure
+
+The prompt structure used in fine-tuning is alpaca format:
+
+"### Human:\n%question%\n\n### AI response:\n%response%"
+
 ## Training Details
 
 ### Training Data