obscuring credentials and more docu

docs/configuration.md

@@ -0,0 +1,13 @@
+# Configuration
+
+## Database connection
+
+* Should work with mysql or mariaDB databases
+* if you do not have access to a database server, go back to index.md to read how to install one locally
+
+To log into the database you need the `host`, the `database name`, the `user` name, and the `password`. 
+Note, the selected user needs at least read access on the selected database (True? maybe also write?).
+
+The root of the fishbook package contains a file called *template_dj_local_conf.json*. copy this file 
+to your project folder, i.e. the location from which you call your scripts, remove the `template_` prefix 
+and fill in `database.host`, `database.user`, `database.password`.