#1063108 Userhelp documentation created

(cherry picked from commit 14e055c7)

entity/UserhelpResources/documentation.adoc

+= Userhelp_entity
+
+== Overview
+
+=== Definition
+The Userhelp_entity functions as an image store for the sites userhelp. 
+
+=== Purpose
+All images displayed in a userhelp document should be located here.
+Once an image is uploaded, it can be referenced by it's id in a userhelp document inside the Designer.
+
+== FAQ
+
+[qanda]
+How do I reference my uploaded image in the designer?::
+    Under the project's preferences->userhelp the two fields have to be configured. +
+    ressourceDomain -> defines the name of the Domain the image should be loaded from, e.g. "https://myAditoCrm.de". +
+    relativePathToRessources -> contains a part of the path, the given default should be sufficient ("/client"). +
+    Inside the userhelp document, the imagepath looks like this: /binary?id=[images id assigned from this entity].