Set official Centaurus 7.0 wallpapers

images/README

+background16x9.png: PNG image, 1920 x 1080, 8-bit/color RGB, non-interlaced		wallpaper for 16x9 monitors (without logotypes)
+background4x3.png:  PNG image, 1600 x 1200, 8-bit/color RGB, non-interlaced		wallpaper for 4x3 monitors (without logotypes)
+boot.jpg:           JPEG image data, JFIF standard 1.01							screen for Plymouth (with logotypes)
+boot.png:           PNG image, 800 x 600, 8-bit/color RGB, non-interlaced		DVD disk menu screen (with logotypes)
+console.jpg:        JPEG image data, JFIF standard 1.01							?
+grub.png:           PNG image, 800 x 600, 8-bit/color RGB, non-interlaced		GRUB loader screen for installed system (with logotypes)
+installer.png:      PNG image, 1920 x 1080, 8-bit/color RGB, non-interlaced		installer backgrount (only right bottom corner is used) (without logotypes)
+product-logo.png:   PNG image, 348 x 45, 8-bit/color RGBA, non-interlaced		product logotype
+wallpaper.png:      PNG image, 1920 x 1080, 8-bit/color RGB, non-interlaced		default wallpaper (without logotypes)