add a README

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+OVERVIEW
+========
+
+The MasterKey Widget Set, or MKWS, is a project to create some very
+simple HTML/JS/CSS widgets that can be dropped into ANY website,
+irrespective of CMS or lack thereof, to enable MasterKey searching.
+
+
+WHAT'S WHAT
+===========
+
+external -- CSS/JS files for external plugins, e.g. Koha
+releases -- released MKWS JS/CSS files, with version number
+images   -- MKWS images and logos
+
+--
+https://mkws.indexdata.com