Update the readme file

[wwdablu]

The readme needs to be updated to use the new grade kts approach:

pluginManagement {
repositories {
google()
mavenCentral()
gradlePluginPortal()
maven(url="https://jitpack.io")
}
}
dependencyResolutionManagement {
repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
repositories {
google()
mavenCentral()
maven(url="https://jitpack.io")
}
}