DOC: first startup

README_SETUP.md

@@ -91,12 +91,13 @@ with the then current version of the stored entities.
 ### Running in a Docker Container
 You can use `.docker/docker-compose.yml` to start a docker container
 (`docker-compose -f .docker/docker-compose.yml up -d`) that runs
-mariadb and you can connect to it with 
-`mariadb -h localhost -P3306 -u caosdb -prandom1234 caosdb`. You need appropriate
-settings in `.config`.
+mariadb. You need appropriate settings in `.config`.
 Due to [a Bug](https://gitlab.com/linkahead/linkahead-mariadbbackend/-/issues/33)
 `MYSQL_CMD="mariadb -h localhost -P3306"` and
 `DATABASE_USER_HOST_LIST=%,`
+After the first start, you need to install the database: `make install`.
+Then, you can connect to it with 
+`mariadb -h localhost -P3306 -u caosdb -prandom1234 caosdb`.
 
 
 ### Troubleshooting