feat: add danmuku plugin and i18n setup documentation

- Created a new documentation file for the danmuku plugin with code examples.
- Added a new documentation file for language settings (i18n) with detailed instructions on language imports, default languages, and how to add or modify languages.
- Included code snippets for initializing the Artplayer with different language settings.

docs/document/assets/en_component_contextmenu.md.CsJAr6Ey.lean.js

@@ -0,0 +1 @@
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