Add release notes into coredns repo (#2645)

* Put release notes in notes subdir

Verbatim copy of the current set of notes on coredns.io. Copy them
here to make them authoritative.

'make sync' on the coredns.io site copies them back in. They need to be
formatted in Hugo style.

Signed-off-by: Miek Gieben <miek@miek.nl>

* pull latest

Signed-off-by: Miek Gieben <miek@miek.nl>

notes/coredns-1.2.4.md

@@ -0,0 +1,31 @@
++++
+title = "CoreDNS-1.2.4 Release"
+description = "CoreDNS-1.2.4 Release Notes."
+tags = ["Release", "1.2.4", "Notes"]
+release = "1.2.4"
+date = "2018-10-17T20:01:29+01:00"
+author = "coredns"
++++
+
+We are pleased to announce the [release](https://github.com/coredns/coredns/releases/tag/v1.2.4) of
+CoreDNS-1.2.4!
+
+Remember we [said the 1.2.3 release](/2018/10/16/coredns-1.2.3-release/) was a big release and took
+quite a while? Well, we've fixed that glitch; as 1.2.4 is here now.
+
+CoreDNS v1.2.3's *kubernetes* plugin **DOES NOT WORK IN KUBERNETES** and our testing that didn't catch
+that regression, nor the Kubernetes scale testing which doesn't really exercise the *whole* API.
+
+## Plugins
+
+* [*cache*](/plugins/cache) use zero of the minimal negative TTL (if no suitable TTL was found in
+  the packet).
+* [*kubernetes*](/plugins/kubernetes) fix a grave bug that made plugin **unusable** in Kubernetes.
+
+## Brought to you by:
+
+Chris O'Haver,
+Miek Gieben.
+
+For documentation see our (in progress!) [manual](/manual). For help and other resources, see our
+[community page](https://coredns.io/community/).