Skeleton of a basic jQuery extension.

jquery.extensionName.js

/*!
 * What the extension does and who made it.
 *
 * Copyright 1970, Who Made It
 * How it's licensed
 */
(function($){
    $.fn.extend({ 
        extensionName: function(options) {
 
            //Settings list and the default values
            var defaults = {
                
            };
             
            options = $.extend(defaults, options);
            //code
        }
    });
})(jQuery);