Add poster presentation of mpm4cps use case.

pages/.gitattributes

+_static/poster-presentation.mp4 filter=lfs diff=lfs merge=lfs -text

pages/use_cases.md

@@ -11,6 +11,8 @@ One model was used to ensure a low speed of the robot when within a safety zone
 
 This paper was presented on October, 16h during the [MPM4CPS workshop](https://msdl.uantwerpen.be/conferences/MPM4CPS/2020/) within the [MODELS 2020 conference](https://conf.researchr.org/home/models-2020). For more information, see the [presented slides](_static/mpm4cps-slides.pdf) or the [a recording of the session](https://youtu.be/Hgc1qFfmr44?t=1220).
 
+There is also a [poster](_static/poster.pdf) and a [pre-recorded presentation](_static/poster-presentation.mp4) of this poster.
+
 The repository with the used source code can be found at: <https://git-st.inf.tu-dresden.de/ceti/ros/mpm4cps2020>
 The usage is dockerized, so starting the application only involves the commands listed below.
 As ROS takes some time to start up, it is best to use separate terminals for the three applications (ROS, Safety-Model, Goal-Model):