What do i do with this girls #?

So im rockin out @ school on my guitar and this hottie walks up and is askin me who i like, (k). then she asks to see my cell, so i show her and she adds her cell number w/out asking, so then she asks for mine, so i tell her and now we got eachothers #! (what does this mean, deos she like me? what should i do) (she didnt even ask if i wanted hers, i do like her tho) (im olny 13)