Add hint in readme

README.md

@@ -67,6 +67,7 @@ $ docker-compose pull
 4. **Configure your instance:**
 For production environments it is recommended to activate and secure the Docker HTTP API. You can read more [here](https://gitlab.ub.uni-bielefeld.de/sfb1288inf/opaque_daemon).
 ``` bash
+$ mkdir logs
 $ cp nopaque.env.tpl nopaque.env
 $ <YOUR EDITOR> nopaque.env # Fill out the empty variables within this file.
 ```