adding a girl on facebook you dont know?

[Jay]

I don't know this girl but I saw her on facebook and she goes to the same University I do. I have never seen her in real life though would it be creepy if I added her as a friend or should I message her first that I see you go to this uni and start a conversation like that?
p.s she doesn't know me either I wanted to add her so I could know her, I know she definitely goes to the same uni as me because I've seen her out clubbing before but I don't think she's seen me.