Document the Videos utility

wiki/src/doc/sensitive_documents/sound_and_video.mdwn

@@ -18,6 +18,13 @@ Tails includes several sound and video applications:
     <span class="application">Sound Recorder</span> are saved to
     the <span class="filename">Recordings</span> folder.
 
+  - **<span class="application">Videos</span>** is an audio and video
+    player.
+
+    For more advanced features, you can install the
+    [<span class="application">VLC</span> media player](https://www.videolan.org/vlc/)
+    using the [[Additional Software|doc/first_steps/additional_software]] feature.
+
 These applications can be started from the
 <span class="menuchoice">
   <span class="guimenu">Applications</span>&nbsp;▸