Add allmende.io

This is the application of Allmende.io to the LibreHosters.

It is a computational common that serves infrastructure for communication, organisation and information.

• Services are linked from https://allmende.io
• Repositories live in
  • https://lab.allmende.io/allmende/
  • https://github.com/allmende/
  • https://lab.libreho.st/allmende/
• We're partly providing and mostly using Ecobytes.net infrastructure, besed on libre.sh
• What we do and who we are is being discussed in https://meta.allmende.io/t/opening-the-circle-of-maintainers-and-publics/339

Wanted to say hi and will introduce the group to talk.libreho.st, before we could merge here.

directory.json

 {
 "aktivix.org" : "https://aktivix.org/librehost.json",
+"allmende.io" : "https://allmende.io/librehost.json",
 "Dark Peak Data Co-operative" : "http://librehosters-api.darkpeak.org/librehost.json",
 "Disroot.org" : "https://disroot.org/librehost/librehost.json",
 "Foss Daily" : "https://fossdaily.xyz/librehost.json",