README.md: add more config details

README.md

@@ -15,4 +15,20 @@ Create Icinga Director database
 
     mysql director < schema/mysql.sql
 
+Configure Icinga Web 2
+----------------------
 
+In your web frontend please go to System / Configuration / Resources and create
+a new database resource pointing to your newly created database. Last but not
+least you have to tell the director module to use this newly created database
+resource.
+
+Given that you named your resource `directordb` the `config.ini` for the module
+could look as follows:
+
+    @@@ini
+    [db]
+    resource = directordb
+
+This file is to be found in <ICINGAWEB_CONFIGDIR>/modules/director/, where
+ICINGAWEB_CONFIGDIR usually means /etc/icingaweb2.