Slightly more text in the README for the time being

README.md

 # CoreDNS
+
+CoreDNS is DNS server that started as a fork of [Caddy](https://github.com/mholt/caddy/). It has the
+same model: it chains middleware.
+
+It is in the early stages of development on should be used on production servers. For now most
+documentation is in the source and some blog articles can be [found
+here](https://miek.nl/tags/coredns/).
+
+<https://caddyserver.com/> is also full of examples on how to structure a Corefile (renamed from
+Caddyfile when I forked it).