Adding fish config

fish/config.fish

@@ -0,0 +1,6 @@
+if status is-interactive
+    # Commands to run in interactive sessions can go here
+end
+
+set fish_color_user normal
+set fish_color_host blue

fish/functions/prompt_login.fish

@@ -0,0 +1,28 @@
+function prompt_login --description 'display user name for the prompt'
+    if not set -q __fish_machine
+        set -g __fish_machine
+        set -l debian_chroot $debian_chroot
+
+        if test -r /etc/debian_chroot
+            set debian_chroot (cat /etc/debian_chroot)
+        end
+
+        if set -q debian_chroot[1]
+            and test -n "$debian_chroot"
+            set -g __fish_machine "(chroot:$debian_chroot)"
+        end
+    end
+
+    # Prepend the chroot environment if present
+    if set -q __fish_machine[1]
+        echo -n -s (set_color yellow) "$__fish_machine" (set_color normal) ' '
+    end
+
+    # If we're running via SSH, change the host color.
+    set -l color_host $fish_color_host
+    if set -q SSH_TTY; and set -q fish_color_host_remote
+        set color_host $fish_color_host_remote
+    end
+
+    echo -n -s (set_color $fish_color_user) "$USER" (set_color normal) / (set_color $color_host) (prompt_hostname) (set_color normal)
+end