Add videos to README

Author: gruberma

README.md

@@ -7,6 +7,16 @@ It is the result of research carried out at the
 at the [University of Passau](https://www.uni-passau.de), Germany.
 
 
+### Video tutorial
+
+[![Conference presentation @ ICSE'23 DEMO](https://github.com/se2p/FlaPy/blob/master/images/flapy_demo_video_screenshot.png)](https://youtu.be/ejy-be-FvDY)
+
+
+### Conference presentation (ICSE'23 DEMO)
+
+[![Conference presentation @ ICSE'23 DEMO](https://github.com/se2p/FlaPy/blob/master/images/flapy_icse_2023_demo_screenshot.png)](https://youtu.be/JUMCW6zZpxc?feature=shared&t=2774)
+
+
 ## Using FlaPy