mrpd: add start of documenation

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+
+====================================
+MMRP, MVRP, MSRP documentation
+====================================
+
+General command string format
+=============================
+
+CCC:X=12233,Y=34567
+
+where CCC is the 3 character command and X and Y are parameters followed by their values.
+
+
+MSRP
+====
+
+S??: query MSRP Registrar database
+
+S+?: (re)JOIN a stream
+
+S++: NEW a stream
+       
+S--: LV a stream
+
+S+L: Report a listener status
+
+S-L: Withdraw a listener status
+
+S+D: Report a domain status
+
+S-D: Withdraw a domain status
+
+