Add a fullscreen image page

[541056967]

Hi, I'm using your fantastic welcome-android to develop welcomPage in my own app. However, the project seems to lack a page to quickly load full-screen images.

TitleP

TitlePage has a TextView instead of fullscreen image, and images load slowly. FullscreenParallaxPage is not convenient to simply load an image.

Therefore, I develop a FullscreenImagePage and FullscreenImageFragment base on WelcomePage to make afullscreen image as the background of the welcome page which uses the Glide to load image.

By the way, I am an incoming Android engineer and I hope you can give me your valuable advice.

Everything goes well with your work