Update 'README.md'

README.md

@@ -28,6 +28,9 @@ Log into an existing server.
 - **whoami**  
 Check which user this session is using.  
 *Return:* `<user>`
+- **send**  
+Sends command to another user's clients. The command will arrive as-is, with the user switched to be the sender instead of the receiver. So if you are fier, and you execute `send,fier2,text,hello`, fier2 will get `send,fier,text,hello`  
+*Arguments:* `<user>,<command>,[argument 1],[argument 2],[...]`
 - **nop**  
 Do (almost) nothing.  
 *Return:* An "empty" response (four bytes denoting the message has a length of 0 and no additional data)