Add package "separation"

packages/separation

+type        = theme
+repository  = https://github.com/roflcopter4/separation
+maintainer  = RoflCopter4 <brendan.leason.4@gmail.com>
+description = An oh-my-fish theme for those who like the output of each 
+              command to be clearly distinguishable from the rest. 
+summary     = A theme which displays a horizontal bar across the terminal for
+              each prompt, visually separating the output of each command.
+              Displays return status (if not 0), username, hostname, and the
+              working directory on the second line. If this string is longer
+              than two fifths of the screen, the prompt is split into a third
+              line, ensuring plenty of space to type commands.