Add a ViewModel to Dessert Clicker: Android Basics in Compose

[yotama9]

The request to add the lines to the build.gradle is unclear. None of the files in the start code have the structure that is required. Simply adding

buildscript {
    ext {
        lifecycle_version = '2.5.1'
    }
}

to build.gradle.kt results with a bunch of errors about buildscript and ext not being defined.