Update README.md

Author: LaelLuo

README.md

@@ -54,7 +54,9 @@ This project follows the [all-contributors](https://github.com/all-contributors/
 
 ## Preparing for use 🍭
 
-Reference: [wechat_assets_picker#preparing-for-use](https://github.com/fluttercandies/flutter_wechat_assets_picker#preparing-for-use-)
+Reference: 
+- [wechat_assets_picker#preparing-for-use](https://github.com/fluttercandies/flutter_wechat_assets_picker#preparing-for-use-)
+- [camera#installation](https://pub.dev/packages/camera#installation)
 
 ## Usage 📖
 
@@ -73,4 +75,4 @@ Reference: [wechat_assets_picker#preparing-for-use](https://github.com/flutterca
 final AssetEntity entity = await CameraPicker.pickFromCamera(context);
 ```
 
-After called and the picker displayed, plus `isAllowRecording` is `true`, tap the shooting button to take a picture, long press the shooting button to record a video.
+After called and the picker displayed, plus `isAllowRecording` is `true`, tap the shooting button to take a picture, long press the shooting button to record a video.