Started a list of CLI reply codes.

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+Reply codes of BIRD command-line interface
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+0xxx   Action suceessfully completed
+1xxx   Table heading
+2xxx   Table entry
+8xxx   Run-time error
+9xxx   Parse-time error
+<space>        Continuation
++      Spontaneous printout
+
+0000   OK
+0001   Welcome
+
+8000   Reply too long
+
+9000   Command too long
+9001   Parse error