First edit of the readme file

A few issues:
1. The date is not formatted as specified with the setHook function.
2. How is the "attachment" variable working?
Second edit

1. The "attachment" property must be added to the widget.js file.

2. Took this off:
* You may have noticed that the date format is variable: it actually depends on today's date. It displays *hier* (yesterday) if the date was yesterday, only the time if it is today, or the full date. To do that, we have simply
defined a hook using the `setHook` method:
    wListView = Widget.create('wListView', undefined, {
        init: function() {
            this.setHook('date', function(dateStr) { return 'the date is: ' + str; })
        }
        });
Merge pull request #11 from melindagallo/patch-3

UPDATED: doc was out of date and was full of typos