add README with disclaimer

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+This is a collection of scripts I created for my own use and thought
+others might find useful. Consider them public domain; most of them will
+probably be trivial enough to fall under fair use in their entirety
+anyway.
+
+I provide no warranty or support of any kind for these scripts and
+disclaim all liability in the event that they brick your computer, give
+you a bad hair day, create mothballs in your closet, introduce your
+first-born to Microsoft Windows, or result in the heat death of the
+Universe.