Integrate freenet free decentralized storage system as optional secondary storage

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

Users cannot seed the files and zites 24/7,keeping files alive could be greatly improved if users could upload files to the system.Filecoin,Story,MaidSafe, which offer a solution to a similar problem of paid young systems which will not work in the near future.Freenet storage system are 100% free and has been operating for more than 15 years it is constantly being supported.Convenient to use without user intervention.It's not needed to be pay or mine if someone wants to store something in it.The problem is leaving no option for free content storage if we goes offline.There should also be a protection from a security point of view to test downloads it is easy to identify who the original owners of the content are.But if the content is loaded from multiple places then the original owner is still offline this not only protects the content from disappearing easily but also protects content owners.There would be a guaranteed free helper seeder for everyone who share something in 0Net.jSite plugin a correct well-functioning plugin for upload files.Similar systems are not ready yet and are designed to be paid.There will be no similar free working decentralized storage system.

Offical site:

https://freenetproject.org/pages/help.html

**Describe the solution you'd like**

In plugins as an optional option.Disk space selection and a complete zite upload feature.And file upload feature in multi user zites like ZeroUp in Zero hello files menu.This could be extended later to other similar protocols like Filecoin,Story,which begin to appear.There could be an option if a file falls under a certain seed then it will be uploaded to the system automatically.If under a zite the files are uploaded to the freenet system one by one there is also no need to wait long for the files to upload.System can reboot serval times and the files could be conveniently uploaded.See jSite plugin but with the difference that uploading will resume automatically even if the computer restarts.

**Describe alternatives you've considered**

Filecoin,Story,MaidSafe Similar P2P projects are all working on this solution but these are paid systems.IPFS it also bolts in support of two this storage systems.Later on,I think more of these storage technologies should be integrated in ZeroNet.And users could choose what they want to use as needed.The problem is that these systems are paid.Or you have to mine often with surreal requirements,or pay,but they do not work to provide a comfortable self-sustaining system.Freenet storage system the only one free system which has been working for a long time. There is no similar system,and no one works on a similar system which is free.Inevitably, following competing softwares,ZeroNet will also integrate these capabilities.Freenet is a long-established,developed,supported reliable system non buggy or rough-and-ready protocols would be integrated with it.

首先查看 jSite 插件和 Zero hello 文件菜单中的 ZeroUp 功能，然后参阅链接的 Freenet 帮助页面。在实现之前，明确集成边界、磁盘空间和可恢复上传的行为，以及可选的辅助存储必须支持的内容。

由索引模型根据 Issue 内容生成。