Add a example of how to make a theme switch in docs/write-a-plugin.md

[hqshi]

Summary

Add a example of how to make a theme switch in docs/write-a-plugin.md, this switch can switch self and auto add dark class to the body

also the light and darkmode's logo can be modified. and the example demo is https://hqshi.cn

darkmode

ligthmode

What kind of change does this PR introduce?

a improvement of Docs

For any code change,

no any code changed

• [ ] Related documentation has been updated, if needed
• [ ] Related tests have been added or updated, if needed

Does this PR introduce a breaking change?

of couse not

Tested in the following browsers:

• [x] Chrome
• [x] Safari(ios)
• [x] Edge(Android)

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Name	Status	Preview	Comments	Updated (UTC)
docsify-preview	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 15, 2024 7:25am