Xcode support for Kotlin browsing and debugging

Allows debugging of Kotlin code running in an iOS application, directly from Xcode.

To use the plugin, commonMain and iosMain folders have been added to an Xcode Group defined in project.pbxproj.

The xcode-kotlin plugin must be installed in a Mac terminal to ...add Kotlin source to Xcode, set up breakpoints, and step through code:

brew install xcode-kotlin

xcode-kotlin install

Reference: https://touchlab.co/xcodekotlin