adds new notes about EXTRA auth
adds registry.txt support (stub file plus link)
change: personal info: via chat or email → via email.
adds note about the registry being online for 24/7
adds info about registry index/new files
adds manual information: mount registry, post new services, cooperate with us with other projects.
adds quickstart connection information. more info should be added in man.ht
removes old placeholder index.html
explains CORE and EXTRA services
adds notice about root/img in README
initial commit, placeholder index.html