https://solutionware.jp/blog/2020/12/11/%E8%87%AA%E5%88%86%E5%B0%82%E7%94%A8%E3%81%AE-gitignore%E7%9B%B8%E5%BD%93%E3%82%92%E4%BD%BF%E3%81%8A%E3%81%86/