doc: Add RFC documents

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+Network Working Group                                           G. Gregg
+Request for Comments: 23                                            UCSB
+                                                         16 October 1969
+
+
+
+                TRANSMISSION OF MULTIPLE CONTROL MESSAGES
+
+
+
+
+The network program at a site must be prepared to send or receive more
+than one control message in a single control communication.
+
+During the time that the control link is blocked awaiting RFNM, it is
+possible that a number of control messages to a particular remote host
+will accumulate.  When the link is unblocked, these should all be sent
+in a single communication for greatest efficiency.
+
+For receiving, it will be necessary to have a loop which returns to
+decode and take action on successive control messages until the control
+communication is exhausted.