modified config docu

local/README.txt

 All of your local configurations and customizations belong in this directory and its
 subdirectories.  Rather than modifying core VuFind files, you should copy them here
-and modify them within the local directory.  This will make upgrades easier.
+and modify them within the local directory.  This will make upgrades easier.
\ No newline at end of file
+ 
+## dev - folder
+
+the dev folder includes all configuration that is needed to run a development system as introduced by 
+
+    https://intern.finc.info/projects/vufind2/wiki/Docker
+
+