update docs

docs/40_⚙️_Configuration/10_init.sh.cfg.md

@@ -143,3 +143,13 @@ MYSQL_USER                    | string | ${APP_NAME}
 WEBROOT                       | string | webroot directory inside apache container; default: /var/www/${APP_NAME}/public_html
 WEBURL                        | string | path of web url to open; default: /
 WRITABLEDIR                   | string | local webroot directory; default: ../public_html
+
+## More variables
+
+You can define more variables in the config that you can se for replacement in your templates.
+
+If you have values that you cannot check in into your repository then
+
+* copy ``init.sh_not_shared.cfg.dist`` to ``init.sh_not_shared.cfg``
+* add ``docker/init.sh_not_shared.cfg`` in gitignore file
+* set you values in ``docker/init.sh_not_shared.cfg``