Add stub for utils.logger.log_interaction

utils/logger.py

@@ -0,0 +1,6 @@
+import datetime
+
+def log_interaction(user_input, model_output):
+    timestamp = datetime.datetime.now().isoformat()
+    print(f"[{timestamp}] USER: {user_input}")
+    print(f"[{timestamp}] MODEL: {model_output}")