add readme for diagnostic/reversing apps

diagnasties/readme.md

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+# Diagnasties
+
+These are some diagnostic applications I wrote to help me reverse engineer
+the network wire protocol used by the KPA-500 and KAT-500 remote software 
+packages, in order that my KPA-500 remote software could emulate the servers
+provided by those packages. 
+
+I also examined the RS-232 wire data as well; though it was all documented
+in the manuals, learning what data is exchanged between the remote applications
+and the hardware (amp and tuner) allowed me to better emulate the servers.
+
+As far as I can tell, using the N1KDO KPA500-remote software running on 
+Micropython is indistiguishable from the "real" Elecraft server code.
+