Added missing osx/install.sh for building fish.app

osx/install.sh

@@ -0,0 +1,31 @@
+#!/bin/sh
+
+# Die if anything has an error
+set -e
+
+# Make sure we're run as root
+scriptname=`basename "$0"`
+if [[ $UID -ne 0 ]]; then
+     echo "${scriptname} must be run as root"
+     exit 1
+fi
+
+# Set the prefix for installation
+PREFIX=/usr/local
+
+# Jump to the Resources directory
+cd "$(dirname "$0")"
+
+# Add us to the shells list
+./add-shell "${PREFIX}/bin/fish"
+
+# Ditto the base directory to the right place
+ditto ./base "${PREFIX}"
+
+# Announce our success
+echo "fish has been installed under ${PREFIX}/ and added to /etc/shells (if it was not already present)"
+echo "To start fish, run:"
+echo "    ${PREFIX}/bin/fish"
+echo "If you wish to change your default shell to fish, run:"
+echo "    chsh -s ${PREFIX}/bin/fish"
+echo "Enjoy!"