add README

README.md

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+Building
+========
+
+```
+mkdir -p ~/go/src/mcs
+ln -s ~/Projects/tbm-go-rots ~/go/src/mcs
+go install mcs/tbm-go-rots/admin
+go install mcs/tbm-go-rots/protocol
+```
+
+Usage
+=====
+
+To get the date from the admin serial interface:
+
+```
+~/go/bin/admin -serial-baud 115200 date
+```
+
+To get the date from the user serial interface:
+
+```
+~/go/bin/protocol -serial-baud 115200 date
+```