Very basic readme (just conversion of text from vim.org)

README.md

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+# Securemodelines
+
+## Description
+
+Secure, user-configurable modeline support for Vim 7.
+
+Vim's internal modeline support allows all sorts of annoying and potentially
+insecure options to be set. This script implements a much more heavily
+restricted modeline parser that permits only user-specified options to be set.
+
+The `g:secure_modelines_allowed_items` array contains allowable options. By
+default it is set as follows:
+
+    let g:secure_modelines_allowed_items = [
+                \ "textwidth",   "tw",
+                \ "softtabstop", "sts",
+                \ "tabstop",     "ts",
+                \ "shiftwidth",  "sw",
+                \ "expandtab",   "et",   "noexpandtab", "noet",
+                \ "filetype",    "ft",
+                \ "foldmethod",  "fdm",
+                \ "readonly",    "ro",   "noreadonly", "noro",
+                \ "rightleft",   "rl",   "norightleft", "norl"
+                \ ]
+
+The `g:secure_modelines_verbose` option, if set to something true, will make
+the script warn when a modeline attempts to set any other option.
+
+The `g:secure_modelines_modelines` option overrides the number of lines to
+check. By default it is 5.
+
+If `g:secure_modelines_leave_modeline` is defined, the script will not clobber
+&modeline. Otherwise &modeline will be unset.
+
+## Install details
+
+Install into your plugin directory of choice.