Add tags.scm for Kotlin

tests/fixtures/languages/kotlin/test.kt

@@ -0,0 +1,16 @@
+interface Greeting {
+    fun greet(name: String): String
+}
+
+class Test : Greeting {
+    private val prefix = "Hello"
+
+    override fun greet(name: String): String {
+        return "$prefix, $name!"
+    }
+}
+
+fun main(args: Array<String>) {
+    val greeter = Test()
+    println(greeter.greet("World"))
+}