add rundgang-video

CONTRIBUTING.md

 # How to contribute a research topic
 
-Thank you for your interest. If there is anything you want to change about anything in this repository, feel free to reach out.  Pull requests are very welcome but by no means mandatory. If you feel overwhelmed and don't know where to start, watch this 5-min kickstart-video:
+Thank you for your interest. If there is anything you want to change about anything in this repository, feel free to reach out.  Pull requests are very welcome but by no means mandatory. 
 
-   https://media.tuhh.de/e10/gabel/research-topics/topic-w-hedgedoc.mp4 
+If you are looking for a guided tour, watch [https://media.tuhh.de/e10/gabel/research-topics/video1_rundgang.mp4](https://media.tuhh.de/e10/gabel/research-topics/video1_rundgang.mp4)
+
+If you feel overwhelmed and don't know where to start, watch this 5-min kickstart-video:
+
+   [https://media.tuhh.de/e10/gabel/research-topics/topic-w-hedgedoc.mp4](https://media.tuhh.de/e10/gabel/research-topics/topic-w-hedgedoc.mp4)
 
 And if you have doubts about compatibility with our institute page, let me show you what is possible.
 
@@ -90,5 +94,3 @@ Choose whatever you feel comfortable with: You can forward your topic.md to me v
 * Message [@cfg0846](https://communicating.tuhh.de/entrance/messages/@cfg0846) on [TUHH-Mattermost](https://communicating.tuhh.de/)
 * Join the discussion in our Mattermost [Research Channel](https://communicating.tuhh.de/signup_user_complete/?id=r3jajdid77dqb8pc81a6nu9g4e)
 
-
-

index.md

@@ -4,6 +4,8 @@ This page hopefully features the past, current and future research interests of
 
 You browse this webpage either by clicking on a **research topic**, a **working group** or a particular **researcher**.
 
+If you are looking for a guided tour, watch [https://media.tuhh.de/e10/gabel/research-topics/video1_rundgang.mp4](https://media.tuhh.de/e10/gabel/research-topics/video1_rundgang.mp4)
+
 The webpage is currently delivered to [https://fabiangabel.gitlab.io/research-topics-mat-tuhh](https://fabiangabel.gitlab.io/research-topics-mat-tuhh).
 
 If you want to contribute a research topic, see the [CONTRIBUTING.md](https://gitlab.com/fabiangabel/research-topics-mat-tuhh/-/blob/master/CONTRIBUTING.md).