Drupal ships with a sitewide contact form since version 4.7 that you can use to allow site visitors to send feedback. As mentioned in the help text on the contact form settings page, you can also use the body area just above the form to give site visitors your postal address or share any other information.
However, because you can't specify an input format for the contact form page, the additional information you add will display without linebreaks or paragraph breaks and look pretty ugly.
There is a simple workaround for this. Just put <br> and <p> tags where you want the linebreaks and paragraphs to appear and you will have a nice looking contact page. Experiment with the line break and paragraph break tags until you are satisfied with the appearance of your contact page.
This functionality has been removed in the Drupal 7 version. The preferred approach is to add a new block using the Block module and setting your new block to be displayed only on the 'contact' path.