Fix plugin id in README.md

[alekseychugaev]

Invalid plugin id in example, correct id should be

plugins {
  id("co.touchlab.native.cocoapods")
}

[alekseychugaev]

Also, before I could make it work for an existing project, I had to update podspec file as in here https://github.com/touchlab/KaMPKit/pull/76/files#diff-65c1831fff220b3ed58c09539ba5f0ec:

and reinstall pod.

Perhaps it's worth including some of it in README.md

[shadowsheep1]

And here another issue in README.md

isStatic = false

must be

framework {
            isStatic = false
}

/cc @ben-whit-ley

[shadowsheep1]

@alekseychugaev you don't need to modify the podspec file, you could generate it with the gradle task provided you set

framework {
            isStatic = false
}

[russhwolf]

Acknowledging yes we could use a docs refresh here.