added README

README

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+nosidebar Plugin for DokuWiki
+
+Disables DokuWikis internal sidebar for individual pages 
+by adding the string ~~NOSIDEBAR~~ to the pages.
+
+All documentation for this plugin can be found at
+https://www.dokuwiki.org/plugin:nosidebar
+
+If you install this plugin manually, make sure it is installed in
+lib/plugins/nosidebar/ - if the folder is called different it
+will not work!
+
+Please refer to http://www.dokuwiki.org/plugins for additional info
+on how to install plugins in DokuWiki.