Implement media tab (#430)

build.gradle

@@ -1,12 +1,14 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 
 buildscript {
+    ext.kotlin_version = '1.1.51'
     repositories {
         jcenter()
         google()
     }
     dependencies {
         classpath 'com.android.tools.build:gradle:3.0.0'
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
 }