Add Kotlin/Stream sample

kotlin-rabbit-functions/src/main/kotlin/com/example/demokotlin/DemoKotlinConfiguration.kt

@@ -0,0 +1,23 @@
+package com.example.demokotlin
+
+import org.springframework.boot.autoconfigure.SpringBootApplication
+import org.springframework.boot.runApplication
+import org.springframework.context.annotation.Bean
+import java.util.function.Function
+import org.springframework.context.annotation.Configuration
+
+@Configuration
+class DemoKotlinConfiguration {
+	@Bean
+	fun uppercase(): (String) -> String {
+		return { it.toUpperCase() }
+	}
+	
+	@Bean
+	fun javaFunction(): Function<String, String> {
+		return Function { x -> x }
+	}
+}
+
+
+