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

error-messages/Number-of-errors.md

+How many errors do we want to show? 
+Just the first one? All of them? 
+
+Maybe something like:
+
+```
+Found 93 errors. Here is the first one:
+
+...
+```
+
+This could maybe be controlled with a flag.
\ No newline at end of file