Pypi package description

まだ誰も着手していません。

Currently the description for `linfa` on `pypi` is empty. Since you are using `Poetry` to fix this you just need to update the `pyproject.toml` file to include the `long_description` or in poetry it's just called `readme`.

At the top of the file it should look like this
```toml
[tool.poetry]
name = "linfa"
version = "0.1.0"
authors = ["LukeMathWalker "]
description = "Python bindings for the Rust crate linfa, a Rust machine learning framework."
readme = "README.md"
```
You can actually use any txt or markdown file so it doesn't have to be the main readme file.
Also, there are some other settings it might be nice to include such as `license`, `repository`, `hompage` (if we have one) etc..
You can find a full list of possible settings [here](https://python-poetry.org/docs/pyproject/)

I can go ahead and open a pull request with these changes but it might be quicker and easier for you to update them yourself since you know which settings are actually relevant

パッケージのメタデータは pyproject.toml にあります。まず [tool.poetry] セクションから始め、その readme 設定を README.md と比較します。PyPI の readme メタデータを設定し、ビルドされたパッケージの説明が設定されていることを確認します。

索引モデルが issue の本文から書いたものです。