Added Minimal Desktop.

MinimalDesktop/Dockerfile

MinimalDesktop/build.sh

MinimalDesktop/files/background.jpg

MinimalDesktop/files/dot_fluxbox/apps

MinimalDesktop/files/dot_fluxbox/init

MinimalDesktop/files/dot_fluxbox/keys

MinimalDesktop/files/dot_fluxbox/lastwallpaper

MinimalDesktop/files/dot_fluxbox/menu

MinimalDesktop/files/dot_fluxbox/overlay

MinimalDesktop/files/dot_fluxbox/windowmenu

MinimalDesktop/files/start_fluxbox.sh

MinimalDesktop/metauser_home/.Xauthority

MinimalDesktop/metauser_home/.bash_logout

MinimalDesktop/metauser_home/.bashrc

MinimalDesktop/metauser_home/.fehbg

MinimalDesktop/metauser_home/.fluxbox/apps

MinimalDesktop/metauser_home/.fluxbox/init

MinimalDesktop/metauser_home/.fluxbox/keys

MinimalDesktop/metauser_home/.fluxbox/lastwallpaper

MinimalDesktop/metauser_home/.fluxbox/menu