feat: add danmuku plugin documentation and i18n setup guide

- Created a new documentation file for the danmuku plugin with code examples.
- Added comprehensive i18n (internationalization) setup instructions, including default language settings, language imports, and examples for adding and modifying languages.
- Updated the structure of the i18n documentation for better clarity and usability.

packages/artplayer/package.json

@@ -1,6 +1,6 @@
 {
   "name": "artplayer",
-  "version": "5.3.0-beta.1",
+  "version": "5.3.0-beta.2",
   "description": "ArtPlayer.js is a modern and full featured HTML5 video player",
   "author": "Harvey Zack <laozhaochaguan@gmail.com>",
   "license": "MIT",