Better documentation

My e-mail subscriptions were off. That's why it took me some time before I noticed this issue ;) .

Installation and usage is really simple. Enable the module and create a new node (or edit existing one). At the submit/edit form you'll find a new group of options, Update message. After typing in a new message, submit the form and you've got your new RSS feed (the path to the feed is the node's path preceeded by updates/, e.g. http://example.com/updates/node/1). You can later add new messages to the feed or delete existing ones. All is done using the node edit form.

I'm going to add the following text to the README.txt file:

Installation and usage
======================

1) Upload and enable the module.
2) Create a new node or edit existing one. At the submit/edit form you will
   find a new group of options, >>Update message<<.
3) Enter a new message (title is not mandatory) and submit the form.
4) The RSS feed will be created automatically. The path to the feed is the
   node's path preceeded by updates/, e.g. http://example.com/updates/node/1.
5) You can later add new messages to the feed or delete existing ones.
   All is done using the node edit form.

Is it clear? Any comments?

I've commited the modified file to CVS.