Add inital 1.9.0 release note (#5145)

* Add inital 1.9.0 release note

Add inital 1.9.0 release note, will update later if there are
more items to add.
Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

* Update notes/coredns-1.9.0.md
Co-authored-by: Chris O'Haver <cohaver@infoblox.com>
Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

* Update notes/coredns-1.9.0.md
Co-authored-by: Chris O'Haver <cohaver@infoblox.com>
Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

* Update notes/coredns-1.9.0.md
Co-authored-by: Chris O'Haver <cohaver@infoblox.com>
Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

* Update version string to 1.9.0
Signed-off-by: Yong Tang <yong.tang.github@outlook.com>
Co-authored-by: Chris O'Haver <cohaver@infoblox.com>

coremain/version.go

@@ -2,7 +2,7 @@ package coremain
 
 // Various CoreDNS constants.
 const (
-	CoreVersion = "1.8.7"
+	CoreVersion = "1.9.0"
 	coreName    = "CoreDNS"
 	serverType  = "dns"
 )

notes/coredns-1.9.0.md

++++
+title = "CoreDNS-1.9.0 Release"
+description = "CoreDNS-1.9.0 Release Notes."
+tags = ["Release", "1.9.0", "Notes"]
+release = "1.9.0"
+date = "2022-02-01T00:00:00+00:00"
+author = "coredns"
++++
+
+This is a release with bug fixes and some new features added. Starting with 1.9.0
+the minimal required go version will be 1.17.
+Wildcard queries are no longer supported by the _kubernetes_ plugin.
+
+
+## Brought to You By
+
+Chris O'Haver,
+Ondřej Benkovský,
+Tomas Hulata,
+Yong Tang,
+xuweiwei
+
+## Noteworthy Changes
+
+* plugin/kubernetes: remove wildcard query functionality (https://github.com/coredns/coredns/pull/5019)
+* Health-checks should respect force_tcp (https://github.com/coredns/coredns/pull/5109)
+```suggestion
+* plugin/prometheus: Write rcode properly to the metrics (https://github.com/coredns/coredns/pull/5126)
+* plugin/template: Persist truncated state to client if CNAME lookup response is truncated (https://github.com/coredns/coredns/pull/4713)