Update README.md

补充

Update README.md
补充
07b3bc6e · 少言 · GitHub · 229bd149 · 07b3bc6e
Unverified Commit 07b3bc6e authored Nov 28, 2017 by 少言 Committed by GitHub Nov 28, 2017
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--- a/README.md
+++ b/README.md
@@ -52,6 +52,12 @@
         }
     }
    ```
+ - 添加权限
+ ```
+  <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
+  <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
+  <uses-permission android:name="android.permission.CAMERA" />
+  ```


 ## link失败手动添加