Update README

Author: chyok

README.md

@@ -10,18 +10,17 @@
 
 ## Simple Usage
 Device A: `st`  
-Device B: `st xxx.txt`  transfer file to A
-
-Device A: `st`  (will show `server address: http://192.168.31.16:9999`)  
-Device B: open `http://192.168.31.16:9999` and upload file
+Device B: `st xxx.txt`  transfer file to A  
+Device B: `st /opt/bin`  transfer bin folder to A   
+Device B: open `http://192.168.31.16:9999(show in A)` and upload file to A
 
 ## Features  
 
 `st` offers a convenient and quick method for file transfer within a local network.  
 
-- Discovers hosts within a local network  
-- Transfers files via HTTP  
+- Auto discover hosts within a local network  
 - Provides a web page access method for file transfer  
+- Folders transfer support 
 
 ## Installation 
 
@@ -40,8 +39,8 @@ go install github.com/chyok/st@latest
 `st` 
 start transer server, waiting transfer.
 
-`st [filename]` 
-transfer file to all servers on the intranet.
+`st [filename|foldername]` 
+transfer file or folder to all servers on the LAN.
 
 `st -p [port]` 
 manually specify the service port, the default is 9999.