Fixed texttests for Kotlin

Kotlin/build.gradle.kts

@@ -2,6 +2,7 @@ import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
 
 plugins {
 	kotlin("jvm") version "1.9.10"
+	application
 }
 
 group = "com.gildedrose"
@@ -32,3 +33,7 @@ tasks.withType<KotlinCompile>().configureEach {
 java {
 	targetCompatibility = JavaVersion.VERSION_1_8
 }
+
+application {
+	mainClass.set("com.gildedrose.TexttestFixtureKt")
+}