Add ktlint Gradle plugin

build.gradle

@@ -1,5 +1,6 @@
 plugins {
     id 'org.jetbrains.kotlin.jvm' version "1.2.60" apply(false)
+    id 'org.jmailen.kotlinter' version '1.16.0' apply(false)
 }
 
 allprojects {

gradle/kotlin.gradle

@@ -1,5 +1,20 @@
 allprojects {
-    plugins.withId('kotlin') {
+    if (it.pluginManager.hasPlugin('kotlin') || it.pluginManager.hasPlugin('apollo-plugin')) {
+
+    }
+}
+
+gradle.projectsEvaluated {
+    configure(subprojects.findAll { it.pluginManager.hasPlugin('kotlin') }) {
+        apply plugin: 'org.jmailen.kotlinter'
+
+        kotlinter {
+            ignoreFailures = true
+            indentSize = 4
+            continuationIndentSize = 4
+            reporters = ['checkstyle', 'plain']
+        }
+
         kotlin { experimental { coroutines 'enable' } }
     }
-}
+}