readme: imgs

Author: rubenfiszel

README.md

@@ -92,6 +92,7 @@ Windmill is <b>fully open-sourced (AGPLv3)</b>:
   ![Step 4](./imgs/windmill-flow.png)
 
 4. (Coming soon) Build complex UI on top of your scripts and flows. 
+  ![Step 5](./imgs/windmill-builder.png)
 
 Scripts and flows can also be triggered by a cron schedule '*/5 * * * *' or through webhooks.