[LINUX] Added theme for xfce4 terminal

https://github.com/chriskempson/base16-xfce4-terminal

$ git clone https://github.com/chriskempson/base16-xfce4-terminal
$ cd base16-xfce4-terminal
$ ./convert2themes
$ sudo cp themes/*.theme /usr/share/xfce4/terminal/colorschemes/