Change to a lib

[tadmanreis]

Hello, I loved your demo and changed to be a package please check it: Parallax Gyro

There is a few change as parameters like: elevation that changes the back image size to be smaller. intensity multiplies gyro value to translate.

If you want I can pass the repository to you to publicate at pub.dev or if you don't mind I can make the package available referencing you and this repository.

Thanks for this awesome demo!