Added README

README.txt

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+NOTE: THIS CODE IS UNMAINTAINED, but is believed to still work fine.
+
+--------------------------------------------------
+ledmon is designed to be used with xmonad / xmobar or any environment
+that needs updates on the state of the caps lock, num lock, and scroll
+lock keys.
+
+ledmon will output a line of data to stdout on invocation, and another
+line whenever the status of these toggles changes.
+
+If caps lock is on, the line will contain the word CAPS.  Likewise
+with NUM and SCROLL.  If all three are off, the line will be empty.