添加muted功能

docs/docs/README.md

@@ -144,6 +144,24 @@ var art = new Artplayer({
 });
 ```
 
+## muted
+
+- Type: `Boolean`
+- Default: `false`
+
+Whether to mute by default
+
+[Run Code](/)
+
+```js
+var url = 'https://blog.zhw-island.com/assets-cdn';
+var art = new Artplayer({
+  container: '.artplayer-app',
+  url: url + '/video/one-more-time-one-more-chance-480p.mp4',
+  muted: true
+});
+```
+
 ## autoplay
 
 - Type: `Boolean`