Add video link

index.md

@@ -1,5 +1,11 @@
 # Nanopub Demo
 
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+[Video for this demo](https://youtu.be/_wmXHgC706I)
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+---
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 This demo gives you a quick hands-on introduction into [nanopublications](https://nanopub.net) via the [Nanodash](https://nanodash.knowledgepixels.com) interface.
 
 Just follow the four steps below.
@@ -42,3 +48,5 @@ We can access this knowledge with queries like these:
 To properly introduce yourself, you can publish an introduction via your [Nanodash profile page](https://nanodash.knowledgepixels.com/profile).
 
 Somebody on the list of [approved users](https://nanodash.knowledgepixels.com/userlist) can now approve your introduction.
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+---