Update README to instruct how to alias the native one (due to Node 22 annoying warning)

Nobody has claimed this yet.

- Node 22 will start showing warnings that `punycode` is deprecated, and a userland solution must be used
- Lots of 3rd party `node_modules` use native `punycode` and many are out of our control. It's too many. Especially because `node-fetch` depends on `punycode`, and even if this itself is now native .... we all know what a chaos is in `node_modules`.
- Anyway, what I did, was to install `module-alias` and then add before anything else (`node -r` or via `NODE_OPTIONS`):

```js
const moduleAlias = require('module-alias');
moduleAlias.addAlias('punycode', 'punycode/');
```

And it works.
I recommend adding this in the README. I can do it, if I know you will accept it.

Update the README with the Node 22 workaround described in the issue, including installing module-alias and loading it with node -r or NODE_OPTIONS. Use the provided addAlias('punycode', 'punycode/') example; done means the README clearly explains how to redirect the native punycode import to the userland package.

Written by the indexing model from the issue text.