add official danmaku data

docs/README.md

@@ -154,10 +154,14 @@ var dp = new DPlayer(option);
 
 ### Danmaku back-end
 
-**Ready-made API:**
+**Official API:**
 
 `https://api.prprpr.me/dplayer/`
 
+**Official danmaku data**
+
+https://github.com/DIYgod/DPlayer-data
+
 **Build yourself:**
 
 Required environment
@@ -207,6 +211,8 @@ $ npm run build
 
 ## Related Projects
 
+- [Official danmaku data (https://api.prprpr.me/dplayer/)](https://github.com/DIYgod/DPlayer-data)
+
 - [DPlayer-for-typecho](https://github.com/volio/DPlayer-for-typecho)
 
 - [Hexo-tag-dplayer](https://github.com/NextMoe/hexo-tag-dplayer)