add kotlin to project

build.gradle

@@ -1,6 +1,7 @@
 // forge's stuff
 
 buildscript {
+    ext.kotlin_version = '1.3.72'
     repositories {
         jcenter()
         maven {
@@ -16,10 +17,12 @@ buildscript {
         classpath 'net.minecraftforge.gradle:ForgeGradle:2.3-SNAPSHOT'
         classpath 'org.spongepowered:mixingradle:0.6-SNAPSHOT'
         classpath 'com.github.jengelman.gradle.plugins:shadow:4.0.3'
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
 }
 
 apply plugin: 'net.minecraftforge.gradle.forge'
+apply plugin: 'kotlin'
 apply plugin: 'org.spongepowered.mixin'
 apply plugin: 'com.github.johnrengelman.shadow'
 
@@ -77,6 +80,7 @@ dependencies {
     compile 'club.minnced:java-discord-rpc:2.0.2'
     compile 'com.github.MrPowerGamerBR:TemmieWebhook:-SNAPSHOT'
     compile 'com.github.kevinsawicki:http-request:http-request-6.0'
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"
 }
 
 processResources {
@@ -144,3 +148,13 @@ jar {
 }
 
 build.dependsOn(shadowJar)
+compileKotlin {
+    kotlinOptions {
+        jvmTarget = "1.8"
+    }
+}
+compileTestKotlin {
+    kotlinOptions {
+        jvmTarget = "1.8"
+    }
+}