Convert root level Gradle files to Kotlin DSL

build.gradle.kts

@@ -0,0 +1,30 @@
+// Top-level build file where you can add configuration options common to all sub-projects/modules.
+plugins {
+    id("com.github.ben-manes.versions") version "0.27.0"
+}
+
+buildscript {
+    repositories {
+        google()
+        jcenter()
+    }
+    dependencies {
+        classpath("com.android.tools.build:gradle:3.5.3")
+        classpath("com.github.zellius:android-shortcut-gradle-plugin:0.1.2")
+        classpath("com.google.gms:google-services:4.3.3")
+        // NOTE: Do not place your application dependencies here; they belong
+        // in the individual module build.gradle files
+    }
+}
+
+allprojects {
+    repositories {
+        google()
+        maven { setUrl("https://www.jitpack.io") }
+        jcenter()
+    }
+}
+
+tasks.register("clean", Delete::class) {
+    delete(rootProject.buildDir)
+}