Humans.txt is an initiative to know who the creator is behind a website. The idea is a simple unabtrusive method of inserting a .txt file and a string in the sites header to point out the .txt file.
This plugin will insert a text file into the root of the website and will continously ensure it remains there. If someone deletes it, the plugin will insert a new copy for you.
You can read more about the Humans.txt initiative at http://humanstxt.org.