Add basic readme

programs/system/dbgboard/README.md

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+## DBGBOARD - a console-based debug board 
+Main advantages over the old board:
+* Bigger font
+* Scrolling (like in other console apps)
+* K : and L: messages highligting
+
+Also, like the old board it writes log to /tmp0/1/boardlog.txt (or you can pass another path in args like `/sys/develop/dbgboard /tmp0/1/hgfdhgfh.txt`), you can view log file in cedit by hitting `F2` key