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-template/vue.js/src/Player.vue

@@ -21,6 +21,7 @@ const $container = ref(null)
 onMounted(() => {
   art.value = new Artplayer({
     ...props.option,
+    url: props.option.url,
     container: $container.value,
     i18n: { id, fr },
     lang: 'fr',