What to write on note to leave on car?

This girl who works near where I work, is really cute and she looks at me often while I am working. I can't interrupt her work, or leave mine to talk to her. I see her car all day. What can I write in a note, with my number for her to text me or call and leave on her car. Would that be weird? I am 19, she is 17-18. We both have Mustangs.
I thought "Hey, Our Mustangs should hang out" and so on. lol Then when she texts me, what do I say? Im not the best with girls.
 
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