add screenshot
add screenshot

wrstlbrnft/java-thumbnailer,benjaminpick/java-thumbnailer,jonilaitinen/java-thumbnailer,wrstlbrnft/java-thumbnailer,benjamin4ruby/java-thumbnailer,benjaminpick/java-thumbnailer,Antea/java-thumbnailer,jonilaitinen/java-thumbnailer,Antea/java-thumbnailer