How to modify module's gradle file to include kotlin file manually for android.

gistfile1.txt

// for compiling kotlin files
apply plugin: 'kotlin-android'
buildscript {
    repositories {
        jcenter()
    }
    ext.kotlin_version = '1.1.4-3'
    dependencies {
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
    }
}

// the dependency setting for kotlin runtime
dependencies {    
    implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
}