By adding “scheduled ” attributes to client method，scheduled tasks can be arranged

The link in intro.md links to html, but it should actually link to md
intro.md中的链接链接到了html，但是实际应该链接到md

Currently, the IO of background task is print to Console directly, we need to use file or in-memory buffer instead.

Hi, I'm the developer of this Program, but I don't have enough time to make my program perfect. I'll appreciate it if you can help me improve it and become a contributor. Here is an existing issue:

This project lacks detailed documentation, please help me fill in using DocFx.
本项目缺乏完备的文档，请帮助我完善。目前的文档系统基于DocFx。

Regarding the contribution methods of documents:

• View existing documents, you can go to https://hit-refresh.github.io/mobilesuit/index.html
• Edit article: Modify the markdown file in the docs/article directory of the warehouse
• Edit API documentation, aka. Xmldoc: Please directly modify the source code files in the code

关于文档的贡献方式：

• 查看现有文档，可前往 https://hit-refresh.github.io/MobileSuit/index.html
• 修改文章：修改仓库docs/article目录下的markdown文件
• 修改API文档，或者说Xmldoc：请直接修改代码中的代码文件

Create a Daemon process when firstly executed, submit long-run tasks to daemon, cli clients can exit and store status to daemon.

For current, named http clients cannot be injected properly.

Hi, I'm the developer of this Program, but I don't have enough time to make my program perfect. I'll appreciate it if you can help me improve it and become a contributor. Here is an existing issue:

This Project lacks Unit Tests, please help me write some.
本项目需要补充一些单元测试，补充一些即可。