pip install options need documentation

What does one get with:
```pip install altdss[all]```

vs.

```pip install altdss```?

Are there other installation options?

This sort of information should be in the top level README as well as near the top of the pypi documentation and the getting started page

首先阅读顶层README和入门页面，然后将文档中的 pip 安装命令与该 package 已发布的安装选项进行比较。更新 README、PyPI 文档和入门页面，解释 altdss[all] 与 altdss 之间的区别，并列出可用选项。

由索引模型根据 Issue 内容生成。