Add --new flag for creating new files for the next day

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This command flag creates new files for the next day.
Just run this command and new files will be created!

➜  swift-aoc-starter-example git:(feature/new-flag) swift run AdventOfCode --new
Building for debugging...
[7/7] Applying AdventOfCode
Build of product 'AdventOfCode' complete! (1.74s)
Created /Users/thongchai.kolyutsaku/Projects/GitHub/swift-aoc-starter-example/Sources/Data/Day01.txt
Created /Users/thongchai.kolyutsaku/Projects/GitHub/swift-aoc-starter-example/Sources/Day01.swift
Created /Users/thongchai.kolyutsaku/Projects/GitHub/swift-aoc-starter-example/Tests/Day01.swift
See your question at https://adventofcode.com/2024/day/1
Good luck!

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