This page is used to test the proper operation of the Web server after generation of a new user id. If you can read this page, it means that the Web server installed at this site is working properly and the user id has been correctly set up.
You may now add content to this directory, and replace this page. Note that until you do so, people visiting your webpage address will see this page, and not your content.
The fact that you are seeing this page indicates that the particular page and directory you just visited is either under construction, or is undergoing routine maintenance.