docs: update AUTHORS file

Signed-off-by: Karel Zak <kzak@redhat.com>
docs: add v2.25-ReleaseNotes

Signed-off-by: Karel Zak <kzak@redhat.com>
build-sys: release++ (v2.25-rc1)

Signed-off-by: Karel Zak <kzak@redhat.com>