Added chat_with_peer in commands. Also explained what peer is.

README.md

@@ -76,6 +76,8 @@ By default public key is stored in the same folder named tg.pub:
     ./telegram -k tg.pub
 
 Client support TAB completion and command history.
+
+Peer refers to the name of the contact and can be accessed by TAB completion.
   
 ### Supported commands
 
@@ -84,6 +86,7 @@ Client support TAB completion and command history.
 
 * **msg** \<peer\> Text - sends message to this peer
 * **fwd** \<user\> \<msg-seqno\> - forward message to user. You can see message numbers starting client with -N
+* **chat_with_peer** \<peer\> starts one on one chat session with this peer. /exit or /quit to end this mode.
 * **add_contact** \<phone-number\> \<first-name\> \<last-name\> - tries to add contact to contact-list by phone
 * **rename_contact** \<user\> \<first-name\> \<last-name\> - tries to rename contact. If you have another device it will be a fight
 * **mark_read** \<peer\> - mark read all received messages with peer