Add install script

bin/install

+#!/usr/bin/env zsh
+
+set -e
+set -u
+
+readonly executable_name=q
+
+readonly local_bin=`stack path --local-bin`
+
+readonly executable_path=$local_bin/$executable_name
+
+stack install
+
+echo >&2
+if [[ -n "${LOCAL_ZSH_COMPLETION_PATH+set}" ]]
+then
+	if [[ -d "$LOCAL_ZSH_COMPLETION_PATH" ]]
+	then
+		ZSH_COMPLETION_SCRIPT_PATH=$LOCAL_ZSH_COMPLETION_PATH/_$executable_name
+		$executable_path --zsh-completion-script $executable_path > $ZSH_COMPLETION_SCRIPT_PATH
+		echo "Installed zsh completions for $executable_name to $ZSH_COMPLETION_SCRIPT_PATH" >&2
+  else
+		echo "Not installing completions, LOCAL_ZSH_COMPLETION_PATH is set but isn't a directory ($LOCAL_ZSH_COMPLETION_PATH)." >&2
+	fi
+else
+  echo "Not installing completions, set LOCAL_ZSH_COMPLETION_PATH to install them." >&2
+fi