added script for update original

scripts/update_original.sh

@@ -0,0 +1,11 @@
+#!/bin/bash
+
+set -eu
+
+SCRIPTS_DIR=`dirname "$0" | xargs realpath`
+ROOT_DIR=`realpath "${SCRIPTS_DIR}/../"`
+ORIGINAL_DIR="${ROOT_DIR}/rustbook-en"
+ORIGINAL_LANG="en"
+ORIGINAL_REPO="https://github.com/rust-lang/book.git"
+
+source "${ROOT_DIR}/common-configs/scripts/update_original.sh"