docs: Update README with github admonitions

Author: daavoo

README.md

@@ -111,9 +111,10 @@ graph TD
     Tool --> Model
 ```
 
-There are different ways to implement the stop condition.
-By default we let the agent decide by generating an output *without* tool executions.
-You can implement additional stop conditions via callbacks.
+> [!IMPORTANT]
+> There are different ways to implement the stop condition. 
+> By default we let the agent decide by generating an output *without* tool executions.
+> You can implement additional stop conditions via callbacks.
 
 ### Callbacks