plugin: add hexo-multiauthor-plugin

[BRAVO68WEB]

Description

Another plugin that I found on Hexo plugin directory "hexo-multiauthor", but that code was depreciated. So, I made a customizable one, will be maintaining for quite few years.

Check List

Please read and check followings before submitting a PR.

• [x] I want to publish my plugin on Hexo official website.
  • [x] I have read the plugin publishing doc.
  • [x] name is unique.
  • [x] link URL is correct.
• [x] Others (Update, fix, translation, etc...)
  • Languages:
  • [x] en English
  • [ ] ru Russian
  • [ ] zh-cn simplified Chinese
  • [ ] zh-tw traditional Chinese

[github-actions[bot]]

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