Add docs about how to use rclone

.gitignore

@@ -0,0 +1 @@
+conf/rclone.conf

README.CN.md

@@ -149,3 +149,4 @@ docker build -t aria2-ui .
   1. 当你以非其他`80` 端口或以启用了HTTPS`443`端口运行程序时，会出现`Aria2 状态 未连接`的错误，这是因为在最新版本里面，我们去掉aria2的独立6800端口，转而使用和网站同一个端口。你可以设置`ARIA2_EXTERNAL_PORT`后重建你的容器。
   2. 下载的BT或者磁力完全没有速度怎么办？ 建议先下载一个热门的BT种子文件，而不是磁力链接。这样可以帮助缓存DHT文件，渐渐地，速度就会起来了。比如试试下载树莓派操作系统的BT种子？[前往下载](https://www.raspberrypi.org/downloads/raspbian/)
   3. 如果你遇到了和 `setcap` 相关的错误，很大程度说明你说运行的Linux不支持使用非`root`用户来运行本Docker 镜像，因此请显式地设置环境变量`PUID`  `PGID` 为 `0` ，也就是使用`root` 来运行
+  4. 如何配置`Rclone`? 如果你想连接`Google Drive` 类似的云存储平台，很遗憾你不能通过浏览器配置，因为网页版本`Oauth` 方式在这里是用不了的，你只能通过命令行的形式来配置，即`rclone config`. 详请请参考官网 [Configuring rclone on a remote / headless machine](https://rclone.org/remote_setup) 以及详细步骤请参考 [issue](https://github.com/wahyd4/aria2-ariang-docker/issues/118)

README.md

@@ -159,3 +159,4 @@ docker build -t aria2-ui .
   1. When you running the docker image with non `80` port or you have HTTPS enabled, you will meet the error says `Aria2 Status Disconnected`, then you will need to set `ARIA2_EXTERNAL_PORT` and recreate your container.
   2. If there is no speed at all when you downloading a BitTorrent file, please try to use a popular torrent file first to help the application to cache `DHT` file. Then the speed should get fast and fast, as well as downloading other links.
   3. If you see any errors related to `setcap` which probably means the Linux you are running doesn't support running this application with `non-root` user. So please specify the `PUID` and `PGID` to `0` explicitly to use `root` user to run it.
+  4. How can I get `Rclone` authenticated? Due to Rclone is running in this docker image only as a component rather than an application, you can only interact with it via `/rclone` endpoint, and no other ports. So the web browser authentication mechanism doesn't work here. Please configure Rclone through command line within the container. You can follow the official doc [Configuring rclone on a remote / headless machine](https://rclone.org/remote_setup) or this [issue](https://github.com/wahyd4/aria2-ariang-docker/issues/118)