First of all, i love how your asking gaming nerds this question
Second, if you are moving in a few weeks, then just say this "Hey [Insert name here] i think your beautiful, nice, and funny. Before I leave, I just wanted you to know, how i feel about you." If she says awwwww and hugs you, then ask her for her phone number, and if she can go see a movie, or if its a nice day, go for a walk in the park.
Third, don't wait to do this, DO IT THE NEXT TIME YOU SEE HER! One of the biggest mistake I ever made was waiting to tell a girl what and how I feel. Seriously, do it, and just be open with her; girls love honesty.
And if you need anymore help, just add me on skype 913-904-8851