createdb: add page (#7851)

pages/common/createdb.md

@@ -0,0 +1,16 @@
+# createdb
+
+> Create a PostgreSQL database.
+> More information: <https://www.postgresql.org/docs/current/app-createdb.html>.
+
+- Create a database owned by the current user:
+
+`createdb {{database_name}}`
+
+- Create a database owned by a specific user with a description:
+
+`createdb --owner={{username}} {{database_name}} '{{description}}'`
+
+- Create a database from a template:
+
+`createdb --template={{template_name}} {{database_name}}`