* release: add 1.5.0 release notes

Add the release notes to the notes/ directory to prepare for a release.
Signed-off-by: Miek Gieben <miek@miek.nl>

* Update notes/coredns-1.5.0.md
Co-Authored-By: miekg <miek@miek.nl>

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

* Update notes/coredns-1.5.0.md
Co-Authored-By: miekg <miek@miek.nl>