self intro for Fisrt HIT Github User Drinkup
Introduction of Harbin Github User Hackathon & Drinkup
correct the mistake of removing void-main's sign up sheet...
Merge pull request #2 from tonyzhu/just_add

submit my sign up sheet
Merge pull request #1 from cliffwoo/Intro

add Introduction of Hackathon & Drinkup, and sheets from cliffwoo & tonyzhu