Add the Tabs tutorial video to Tabs section

Adding the video under the header to provide overview to users.

Author: jjsilva4

gitkraken-client/interface.md

@@ -265,6 +265,12 @@ For a given vertical track, you can read from bottom to top, and right to left t
 
 ## Tabs
 
+<div class='embed-container embed-container--16-9'>
+    <iframe width="560" height="315" src="https://www.youtube.com/embed/Wmjobrj0Qw?ecver=1" frameborder="0" allowfullscreen></iframe>
+</div>
+
+***
+
 Quickly switch between multiple repositories.
 
 <img src='/wp-content/uploads/tabs.gif' class='figure img-floated img-floated--right'>