Edit README.md to specify Jetbrains IDE (PhpStorm/Webstorm/IntelliJ) support

[MichelJonkman]

Because PhpStorm, Webstorm and IntelliJ have integrated Typescript support, all the exported typings work perfectly fine and only the special shortcuts like @items is missing. I think it'd be beneficial if this was clarified in the README.md by specifying that the mod exports valid Typescript typings for KubeJS that any IDE with Typescript support can use.

In addition it'd be nice if we could export without making a .vscode folder, maybe using /probejs typings?