Add to a VOIP Call sevice with a browser interface

**Is your feature request related to a problem? Please describe.**

Not easy to find a good working VOIP service. And almost impossible what decentralized, protect the user anonymity, can use proxy, does not ask private data, easy to use. A VOIP service itself can attract many users. Easy to set up, works with x86 multiple platforms and older OS systems too. And a powerful social media tool with which ZeroNet can many new users can be obtained.

**Describe the solution you'd like**

A VOIP Call sevice with a browser interface. As a service like ZeroMail, ZeroUp, ZeroMe.
With Video Call and standart call service, chat and file share option, in ideal way telephone book where people can search users. User online icon what only can see the accepted users. And a alert sytem when a user goes online, send MSG ETC. And important easy to use in mobile devices!

**Describe alternatives you've considered**

Tested: WhatsApp, Skype, Viber, Talky, ooVoo, WeChat.

Most of them are useless. Some of them without a mobile phone and phone adress unusable. And lot of them does not workig in serval platforms. Very much of them are use a centralized network. And imposible to set up a simple proxy. Asking too much sensitive private data like phone number. A simple good working platform like [Jami](https://jami.net/) will be ideal.

ZeroNet have the existing platform what currently solve many of this issues. What the most VOIP servieces does not have. And in this platform we can set up a powerful good quality VOIP service. ZeroNet are working multiple platform Phones!, Linux, and Windows systems.

The issue names no files, tests, or entry points. Start by surveying how ZeroNet services such as ZeroMail, ZeroUp, and ZeroMe are structured, then establish a narrower scope and acceptance criteria for the browser-based VOIP, video, chat, file-sharing, and mobile requirements.

索引モデルが issue の本文から書いたものです。