Create mark model in course app

[Victhereum]

The mark model should look like this or better
class StudentMarks(TimeBaseModel):
tutor = models.ForeignKey(Instructors, related_name='given_marks', on_delete=models.CASCADE)
student = models.ForeignKey(Student, related_name="marks", on_delete=models.CASCADE)
course = models.ForeignKey(Courses, on_delete=models.CASCADE)
marks_obtained = models.IntegerField()
maximum_marks = models.IntegerField()