The block can be included by the admin on the main page. The block offers a link to the plugin settings. The block defines a capability for using the settings form. So you can give other roles access to the plugin. By Default only the admin has access. In the form you can set the path and filename of the input file. It must be within the moodledata. The path should be given relative to the moodledata.
The csv field delimiter has to be the ';'.
NOTE: In Github we use an empty master branch. The different plugin versions can be found in special branches for each Moodle version.