first publicised back in September
https://www.bleepingcomputer.com/news/security/security-txt-standard-proposed-similar-to-robots-txt/
September 15, 2017
Ed Foudil, a web developer and security researcher, has submitted a draft to the IETF — Internet Engineering Task Force — seeking the standardization of security.txt, a file that webmasters can host on their domain root and describe the site's security policies.