Added theme "Zish" and preview

themes/zish/fish_prompt.fish

+# name: Zish
+
+function _is_git_dirty
+  echo (command git status -s --ignore-submodules=dirty ^/dev/null)
+end
+
+function fish_prompt
+  set_color -o red
+  printf '┌─<'
+  set_color -o blue
+  printf '%s ' (whoami)
+  set_color $fish_color_autosuggestion[1]
+  printf '@ '
+  set_color cyan
+  printf '%s ' (hostname|cut -d . -f 1)
+  set_color $fish_color_autosuggestion[1]
+  printf 'in '
+  set_color -o green
+  printf '%s' (prompt_pwd)
+  set_color -o red
+  printf '>'
+  
+  echo
+  set_color -o red
+  printf '└─<'
+  set_color yellow
+  printf '%s' (__fish_git_prompt)
+  if [ (_is_git_dirty) ]
+    set_color blue
+    printf '* '
+  end
+  set_color -o red
+  printf '>──'
+  set_color yellow
+  printf '» '
+  set_color normal
+end
\ No newline at end of file

themes/zish/fish_right_prompt.fish

+function fish_right_prompt
+  set -l exit_code $status
+  if test $exit_code -ne 0
+    set_color red
+  else
+    set_color green
+  end
+  printf '%d' $exit_code
+  set_color yellow
+  printf ' < %s' (date +%H:%M:%S)
+  set_color normal
+end
\ No newline at end of file