add(autogen): add example image

Author: hahuyhoang411

docs/docs/examples/autogen.md

@@ -94,4 +94,6 @@ Set a dummy enviroment variable for OpenAI
 export OPENAI_API_KEY=sk-***
 ```
 
-You're all set! Test your agent in the `Playground`.
+You're all set! Test your agent in the `Playground`.
+
+![Example local LLM with Autogen](img/autogen_stealth.png)