Add sample func

lib/build.gradle.kts

@@ -1,4 +1,5 @@
 plugins {
+    id("java-library")
     id("io.spring.dependency-management")
     kotlin("jvm")
     kotlin("plugin.spring")

lib/src/main/java/com/example/lib/MyUtils.java

@@ -0,0 +1,7 @@
+package com.example.lib;
+
+public final class MyUtils {
+    public static String helloWorld() {
+        return "Hello World";
+    }
+}