Add protocol to supply ZN Coin mining.

I hope there will be a corresponding coin, such as ZN coin, to incentivize nodes involved in building sites or participating in caching. Additionally, a distributed DNS server can be set up, allowing site owners to spend ZN coin to purchase domain names through the protocol.
In my opinion, ZeroNet is the true Web3.

该 issue 没有列出任何文件、测试或入口点。首先与维护者明确拟议的 ZN Coin 激励机制、挖矿协议和分布式 DNS 要求；在就其范围和验收标准达成一致之前，这项工作还未准备好实施。

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