zsh install script

scripts/installers/zsh-install.sh

@@ -0,0 +1,9 @@
+#!/usr/bin/env bash
+
+# Install and set zsh as the default shell.
+
+# Import library
+source $(dirname ${BASH_SOURCE[0]})/install-lib.sh
+
+sudo $(packageManager) install zsh
+chsh -s $(which zsh)