Add default description for XSS modules

Author: rastating

lib/wpxf/wordpress/xss.rb

@@ -11,6 +11,12 @@ module Wpxf::WordPress::Xss
   def initialize
     super
     @success = false
+    @info[:desc] = 'This module stores a script which will be executed when '\
+                   'an admin user visits the vulnerable page. Execution of the script '\
+                   'will create a new admin user which will be used to upload '\
+                   'and execute the selected payload in the context of the '\
+                   'web server.'
+
     register_options([
       StringOption.new(
         name: 'xss_host',