added chinese version of readme

README.md

@@ -1,3 +1,6 @@
+- [English](README.md)
+- [简体中文](README.zh-CN.md)
+
 An easy-to-use web interface for Aria2 and youtube-dl
 
 - Search for torrents within the app from mutiple BT sites
@@ -7,7 +10,21 @@ An easy-to-use web interface for Aria2 and youtube-dl
 <img width="800" alt="nc4" src="https://user-images.githubusercontent.com/3911975/142444998-54dd54a6-0c8e-4d49-8188-270964a99c50.png">
 <img width="800" alt="nc5" src="https://user-images.githubusercontent.com/3911975/142445020-27ec389a-5437-4d28-acc0-5e757fd6897d.png">
 
-#### How to build front-end code
+### How to use
+
+the latest version has included both youtube-dl and aria2c and there is no need for manual installation (*tested it successfully with snap version of nextcloud both in centos7 and ubuntu 20.04*)   
+if for some reason,the builtin binaries don't work for you, then you will need to install them yourself
+
+#### installing aria2 and youtube-dl in ubuntu
+```bash
+sudo apt install aria2
+sudo curl -L https://yt-dl.org/downloads/latest/youtube-dl 4 -o /usr/local/bin/youtube-dl
+sudo chmod a+rx /usr/local/bin/youtube-dl
+```
+local versions will be chosen over the builtin ones.
+But you can force the app use a specific version by setting the binary path manually. When the binary is valid, it has the highest priority and all other versions will be ignored
+
+### How to build front-end code
 
 NPM 7.0+ and node 14.0.0+ are required to build front-end scripts