10 points how can i talk to this girl i like?

well i like this one girl. I liked other girls in the past but not like this i am madly in love i can't stop thinking about her. i can't or do anything. will i was on facebook and i typed her name on the search bar and she came up i know its her because it has a pic of her so school is about to end this thursday but i get really shy when i am next to her i know shes shy too shes not a crazy girl or a emo girl is clam and smart so but to the point how can i tell her on facebook i just what to be friends i haven't added her but i will and i what to send her a message when i do please help and maybe in the future i will ask her out