Add some docs about how to use `scope`

[mattwynne]

Hey, thanks for this little gem of a library 👍 🎉

I was trying to figure out how to replace the default zoya scope in the log messages, and here's what I came up with:

const logger = zoya({
  fields: [scope({ scopes: ['main'] }), separator(), badge(), label(), separator(), message(), context()],
})

Is this the right way to do it? I figured this out by reading the tests (which were very easy to read 👍 ) but I'm not sure if I've missed something:

• why is scopes an array? What happens if I define multiple scopes?
• can I specify the scope when logging a message? If so, how?

I guess some more examples might be useful. The santa one is cute but not very illustrative :)

If you prefer to just explain to me here in the issue how to use it, I can send a PR with an update to the docs.

[WoLfulus]

Hey!

Glad you liked it, and sorry for just seeing this today.

why is scopes an array? What happens if I define multiple scopes?

The scopes are just a way to differentiate the log sources, I use it when outputting JSON to log aggregators that supports extraction/filters.

You can use transform to output scopes in a different format if you want (in text mode)

can I specify the scope when logging a message? If so, how?

Unfortunately there's no way to change the scope when writing individual messages, but you can use the enhance example to clone the same logger setup into different scopes and use those instead.