Update DOCUMENTATION.md

Author: jonassiewertsen

DOCUMENTATION.md

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+# How does it work?
+
+First of all, you need to make screen recordings, on how your site works. This part only needs to be done once by 
+yourself. I can't help you there.
+
+Upload your videos, give them a name and maybe a short description if you want. The addon will display all videos nicely 
+and your clients can watch those videos over and over again, by just logging onto the control panel. 
+
+Your videos will be hosted by the client himself and he cant lose a link to them or anything similar. How great is that?
+
+English and German translation is already provided, but you can easily add your own translation to the addon. 
+
 # Installation 
 
 This addon works with **Statamic 3** only!