Update README.md

README.md

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 mousejiggler
 ============
 
+Mouse Jiggler is a very simple piece of software whose sole function is to "fake" mouse input to Windows, and 
+jiggle the mouse pointer back and forth.
+
+Useful for avoiding screensavers or other things triggered by idle detection that, for whatever reason, you 
+can't turn off any other way; or as a quick way to stop a screensaver activating during an installation or 
+when monitoring a long operation without actually having to muck about with the screensaver settings.
+
+Operation
+=========
+
 Simply run the MouseJiggle.exe included in the release .zip file. Check the "Enable jiggle?" checkbox to start
 jiggling the mouse pointer; uncheck it to stop. The jiggle is slight enough that you should be able to use the
 computer normally even with jiggling enabled.