Introduced directories into the wiki and added content based on my talk with Bodo and my own thoughts

error-messages/linking-to-docs.md

+In our error messages we could link to do concepts if needed.
+This way you can keep the error message itself shorter as you don't have to explain in the error message what something like a tensor comprehension is or a type pattern.
+Instead, you can just link to the wiki.
+The documentation should be in a format like this wiki using a simple markup language. 
+
+Even if we don't have the actual wiki pages, yet it will still be good to link somewhere so that the wiki page can be added later.
+