Add instantcloud.cn by Redstar Consultants (#696)

Redstar Consultants provides various services to companies starting in or expanding their business to China. Domains within this suffix are used to provide clients our services of internally validating their business project on Chinese cloud hosting providers usually before being hosted on their own domain and/or being made publicly accessible.

Being added to the public suffix list is required

• to properly handle namespaces by browser

• to prevent cookie based attacks across client pages

• to avoid letsencrypt limitations

• to aim for a clear separation between multiple client projects.