Listing a low-level expository work on your CV
At this stage of your academic career, I would go ahead and include the article on your CV.  You are a student, and publication in a student journal is a meaningful accomplishment, even if publication in a research journal would be a significantly greater one.  I see CVs from students with masters degrees in applied math that sometimes have these kinds of things listed, and I don't think anyone has a problem with their appearance.  And you can always get feedback from the faculty in your current program, as to whether they would like to see something like that on a student's CV.

If you think the name of the journal will make its nature clear to anyone viewing your CV, then that will probably be fine; however, if you have any doubts (and you definitely do not want to give anyone the impression that you are attempting to be misleading on your CV), you may want to include a bracketed note "[student journal]" just to be clear.

Later, you may want to drop this item from your CV.  When you have a doctorate and have published multiple articles in research-level journals, people may wonder why you have included something so minor among your accomplishments.  But you are not to that stage yet, so including it at present is probably fine.