updated readme with pictures

README.md

@@ -2,6 +2,14 @@
 
 Web interface for MARK server.
 
+![Cascade of detectors](figures/cascade.png)
+
+![Ranking produced by a detector](figures/ranking.png)
+
+![Report produced by a detector](figures/report.png)
+
+![System status](figures/status.png)
+
 ## Contributing
 
 Start a mongodb container and a mark-example container so we have some toy
@@ -11,7 +19,7 @@ data to display:
 docker-compose up
 ```
 
-Start a small webserver
+Start Laravel integrated webserver
 
 ```bash
 php artisan serve