docs(readme): add example images

README.md

@@ -22,7 +22,11 @@ You can start with [quick start](https://diagram.mingrammer.com/docs/installatti
 
 ## Examples
 
-You can find some examples in [examples](https://diagrams.mingrammer.com/docs/examples) page.
+| Grouped Workers                                              | Clustered Web Services                                       | Event Processing                                             |
+| ------------------------------------------------------------ | ------------------------------------------------------------ | ------------------------------------------------------------ |
+| ![grouped workers](https://diagrams.mingrammer.com/img/grouped_workers_diagram.png) | ![clustered web services](https://diagrams.mingrammer.com/img/clustered_web_services_diagram.png) | ![event processing](https://diagrams.mingrammer.com/img/event_processing_diagram.png) |
+
+You can find all examples in [examples](https://diagrams.mingrammer.com/docs/examples) page.
 
 ## Contributing