chore: add readme and adapt license

[Uzlopak]

@mcollina
@jsumners

Modified the license, but I personally think it is a reimplementation.

I extended the readme.

Just one remark:

If I would had no limitations, i would have generated a new Function via the Function constructor. That would have been the fastest solution possible. But I assume that this would have resulted in devs complaining about pino breaking in vercel environments and other environments where eval and new Function() is forbidden or removed. If you want I can add such a Function Generator in the next iteration. I dont think it will take much effort to implement that. We have already all lookupArrays for fast string generation. And we have the tokenizer. I guess that would be like 20 more lines(?). Anyhow, i dont know how the heuristics are in vercel and co, and if they throw an Error only by detecting new Function calls?

But I didnt investigated the potential perf gain of such an approach and well... this package is already faster than the original by a magnitude.

[mcollina]

You can use New function

[mcollina]

Please remove "dependency review" not sure what that is.

[mcollina]

lgtm

[Uzlopak]

@jsumners ptal