update .gitignore for android studio project files (#2)
update .gitignore for android studio project files (#2)

sylvain121/gaminganywhere,masterall/gaminganywhere,chunying/gaminganywhere,masterall/gaminganywhere,yunyu-Mr/gaminganywhere,chunying/gaminganywhere,yunyu-Mr/gaminganywhere,masterall/gaminganywhere,sylvain121/gaminganywhere,yunyu-Mr/gaminganywhere,sylvain121/gaminganywhere,chunying/gaminganywhere,sylvain121/gaminganywhere,sylvain121/gaminganywhere,chunying/gaminganywhere,yunyu-Mr/gaminganywhere,sylvain121/gaminganywhere,masterall/gaminganywhere