CCD: Whitelist address for router/firewall

Symptoms:

• User asking about what IP/PORT or address to enable on firewalls
• User asking about what IP/PORT to enable on routers

Cause:

Some users have firewalls and routers that may block CCD or CDN from being downloaded

Resolution:

Users are asked to include the following website on their firewall/router whitelist

*.client-api.unity3dusercontent.com