Investigate ways to support data

There are few places where data really becomes important. Tests, notebooks, and generally for the package.

We've seen many instances where a package requires a large amount of data to run. But it's impractical to include that data in the distribution. We've come up a few specific ways to address that, but let's consider if there's a way that we can include a best practice approach in the template as well.

まず、現在の template がテスト、notebook、パッケージデータをどのように扱っているかを確認し、その後、検討中のデータ管理アプローチを評価します。template に含められるベストプラクティスのアプローチを選定して文書化すれば完了です。