Add utility script to quickly set up part two

2022/copy.sh

@@ -0,0 +1,13 @@
+#!/bin/bash
+set -euo pipefail
+
+if [[ "$#" != "1" ]]; then
+  echo "  Usage: ./copy.sh <day>"
+  echo "Example: ./copy.sh 13"
+  exit 1
+fi
+
+from="day${1}-part1"
+to="day${1}-part2"
+cp -r "$from" "$to"
+sed -i -e "s/$from/$to/g" "$to/Cargo.toml"