provide relationships semantics along with names

[evshvarov]

now relationships are being displayed with their cardinality (parent-child, one-many).
Could you please also add the semantics too?
E.g. Student earnedGrade many Mark hasGiven one.

It will be more useful if two classes have more than one relationships with each other

[nikitaeverywhere]

I hope "you" is not me and someone else could pick it up 😌