test(samples): add new samples

Author: kotlin-samples-pusher-bot

src/test/resources/test-compile-data/jvm/kotlin-web-site/data-classes/fa904e89c90d83dbbc06452d7eb4d6e5.2.kt

@@ -0,0 +1,13 @@
+data class Employee(val name: String, val roles: MutableList<String>)
+
+fun main() {
+    val original = Employee("Jamie", mutableListOf("developer"))
+    val duplicate = original.copy()
+
+    duplicate.roles.add("team lead")
+
+    println(original) 
+    // Employee(name=Jamie, roles=[developer, team lead])
+    println(duplicate) 
+    // Employee(name=Jamie, roles=[developer, team lead])
+}