Add kotlin support

Summary:
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changelog: Add kotlin support for the android library

Reviewed By: LukeDefeo

Differential Revision: D38746572

fbshipit-source-id: f49534072eee3854368ea6f725e726560c03d76e

android/build.gradle

@@ -6,6 +6,7 @@
  */
 
 apply plugin: 'com.android.library'
+apply plugin: 'kotlin-android'
 
 android {
     compileSdkVersion rootProject.compileSdkVersion
@@ -62,6 +63,8 @@ android {
 
     dependencies {
         compileOnly deps.proguardAnnotations
+        implementation deps.kotlinStdLibrary
+
         implementation deps.openssl
         implementation deps.fbjni
         implementation deps.soloader

build.gradle

@@ -52,6 +52,8 @@ ext {
 }
 
 ext.deps = [
+        // Kotlin support
+        kotlinStdLibrary   : "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$KOTLIN_VERSION",
         // Android support
         supportAnnotations : "androidx.annotation:annotation:$ANDROIDX_VERSION",
         supportAppCompat   : "androidx.appcompat:appcompat:$ANDROIDX_VERSION",