Update common questions to readme.

README.en.md

@@ -12,6 +12,7 @@
   - [Upgrade](#upgrade)
   - [Advanced features](#advanced-features)
   - [Get your downloaded files](#get-your-downloaded-files)
+  - [Questions](#questions)
   - [Just want to a standalone image?(e.g. Running in Synology NAS)](#just-want-to-a-standalone-imageeg-running-in-synology-nas)
 
 <!-- /TOC -->
@@ -119,6 +120,9 @@ This repository contains several docker-compose files to help you running a Aria
 ## Get your downloaded files
   In docker-compose, we used `/data` as the docker volumn folder to storage all kinds of files. So you can find your files in `/data`
 
+## Questions
+
+  * Have no rights to manage the files you downloaded? Considering using `root` user to run docker program. Please refer: <https://askubuntu.com/questions/477551/how-can-i-use-docker-without-sudo>
 ## Just want to a standalone image?(e.g. Running in Synology NAS)
   ```bash
     docker run --rm  -p 8000:80  -p 6800:6800 -v ~/data/:/data wahyd4/aria2-ui

README.md

@@ -13,6 +13,7 @@
   - [高级特性](#高级特性)
   - [找到你下载的文件](#找到你下载的文件)
   - [只想运行一个镜像？(如：在群晖中运行)](#只想运行一个镜像如在群晖中运行)
+  - [常见问题](#常见问题)
   - [感谢](#感谢)
 
 <!-- /TOC -->
@@ -147,6 +148,10 @@
   * FileManger: <http://localhost:8000/files>
 
   关于该镜像的更多使用介绍，请参考：<https://github.com/wahyd4/aria2-ariang-docker>
+
+## 常见问题
+
+  * 没有权限管理下载的文件？ 请考虑使用 `root` 用户运行 docker 程序。延伸阅读： <https://askubuntu.com/questions/477551/how-can-i-use-docker-without-sudo>
 ## 感谢
 
   * 创建 docker-compose 这个想法灵感源自于阅读了这帖子 <https://www.v2ex.com/t/383801>