WHERE is the documentation?

This plugin looks great, but I How can I use it without the documentation? I was searching by google of course, but no result! How can the other people use it with any documentation? This is a big mystery for me 😀 Can you, please, send me a link to documentation or shortcodes page? I am not sure if it exists at all…

Generally this is the problem of 90 % WP plugins – you must be a detective to find any documentation for any plugin. It driving me crazy 🙁

http://wordpress.org/plugins/contact-form-7-dynamic-text-extension/