How to add a friend

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+Socket receive messages:
+       1) Check authenticity.
+               a) From self, accept any commands.
+               b) From a friend, accept some commands.
+               c) From unknown friend, accept less commands, or queue
+                       for authorization.
+
+Example: add new friend
+
+1) Receive message from unknown friend.
+2) Add to queue (inbox?) for friendship.
+3) Self connects, ask for last messages in queue (inbox).
+4) Self sends message adding friend.