We are always saying that, but the only file we generate is one full of additional information for the searchbots: robots.txt. Then why not doing one for ourselves?
I used the WordPress plugin to make adding the humans.txt file even simpler than it already is. With the plugin you just need to type in what you want and then save the information to WordPress.
You can use the code provided with the plugin to have your last published date, your list of plugins, your WordPress theme and assorted other things automatically updated. This was really nice because I know I won’t be thinking to update this file next time I manage the plugins I’m using. Some site automation is a great thing!
I added ASCII art (my artist stick figure) to the humans.txt file too. Being plain text it worked fine!