Initial Kotlin CI/CD setup

src/main/kotlin/Main.kt

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+fun main() {
+    println("Hello, Kotlin CI/CD world!")
+}

src/test/kotlin/MainTest.kt

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+import kotlin.test.Test
+import kotlin.test.assertEquals
+
+class MainTest {
+    @Test
+    fun testExample() {
+        val result = 2 + 2
+        assertEquals(4, result)
+    }
+}