Add Kotlin plugin and dependency

build.gradle

@@ -21,6 +21,7 @@ ext {
     targetSdkVersion = 26
     buildToolsVersion = "26.0.0"
     supportLibraryVersion = "25.4.0"
+    kotlinVersion = "1.1.3"
 }
 
 task clean(type: Delete) {

rocket-chat-android-widgets/build.gradle

 apply plugin: 'com.android.library'
+apply plugin: 'kotlin-android'
 
 buildscript {
     repositories {
         jcenter()
+        mavenCentral()
     }
     dependencies {
         classpath 'com.android.tools.build:gradle:2.3.3'
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$rootProject.ext.kotlinVersion"
     }
 }
 
@@ -44,6 +47,8 @@ dependencies {
     compile "com.android.support:support-v13:$rootProject.ext.supportLibraryVersion"
     compile "com.android.support:design:$rootProject.ext.supportLibraryVersion"
 
+    compile "org.jetbrains.kotlin:kotlin-stdlib-jre7:$rootProject.ext.kotlinVersion"
+
     compile 'org.nibor.autolink:autolink:0.6.0'
 
     compile 'com.amulyakhare:com.amulyakhare.textdrawable:1.0.1'