Add an example of how to create a database and a user dedicated to that

database with a PostgreSQL container.

silverpeas/content.md

@@ -38,12 +38,27 @@ In [Docker Hub](https://hub.docker.com/), no Docker images of Microsoft SQLServe
 $ docker run --name postgresql -d \
     -e POSTGRES_PASSWORD="mysecretpassword" \
     -v postgresql-data:/var/lib/postgresql/data \
-    postgres:9.6
+    postgres:12.3
 ```
 
 We recommend strongly to mount the directory with the database file on the host so the data won't be lost when upgrading PostgreSQL to a newer version (a Data Volume Container can be used instead). For any information how to start a PostgreSQL container, you can refer its [documentation](https://hub.docker.com/_/postgres/).
 
-Once the database system is running, a database for Silverpeas has to be created and a user with administrative rights on this database (and only on this database) should be added; it is recommended for a security reason to create a dedicated user account in the database for each application and therefore for Silverpeas. In this document, and by default, a database `Silverpeas` and a user `silverpeas` for that database are created.
+Once the database system is running, a database for Silverpeas has to be created and a user with administrative rights on this database (and only on this database) should be added; it is recommended for a security reason to create a dedicated user account in the database for each application and therefore for Silverpeas. In this document, and by default, a database `Silverpeas` and a user `silverpeas` for that database are created. For example:
+
+```console
+$ docker exec -it postgresql psql -U postgres
+psql (12.3 (Debian 12.3-1.pgdg100+1))
+Type "help" for help.
+
+postgres=# create database "Silverpeas";
+CREATE DATABASE
+postgres=# create user silverpeas with password 'thesilverpeaspassword';
+CREATE ROLE
+postgres=# grant all privileges on database "Silverpeas" to silverpeas;
+GRANT
+postgres=# \q
+$
+```
 
 ### Start a Silverpeas instance with the default configuration