Use Kotlin DSL for library gradle files (#3628)

buildSrc/src/main/kotlin/AndroidConfig.kt

@@ -0,0 +1,6 @@
+object AndroidConfig {
+    const val compileSdk = 27
+    const val minSdk = 16
+    const val targetSdk = 27
+    const val buildTools = "29.0.3"
+}

buildSrc/src/main/kotlin/Deps.kt

@@ -3,4 +3,7 @@ object Deps {
         const val version = "1.3.72"
         const val stdlib = "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$version"
     }
+
+    const val jsoup = "org.jsoup:jsoup:1.13.1"
+    const val okhttp = "com.squareup.okhttp3:okhttp:3.10.0"
 }