add known issues in changelog.md for release v1.0.0 (#7536)
add known issues in changelog.md for release v1.0.0 (#7536)

* release v1.0.0

Signed-off-by: Neha Lohia <f4de79d563527a13eac288e9d7c9963a80db7406@gmail.com>

* add the known issues no in changelog.md for release v1.0.0

Signed-off-by: Neha Lohia <f4de79d563527a13eac288e9d7c9963a80db7406@gmail.com>
kubernetes/ingress-nginx,canhnt/ingress,kubernetes/ingress-nginx,kubernetes/ingress-nginx,kubernetes/ingress-nginx,canhnt/ingress,canhnt/ingress,canhnt/ingress,kubernetes/ingress-nginx