cleanup

tools/gradle/simplegradlekotlin/src/main/java/hello/HelloGradleKotlin.java

@@ -0,0 +1,15 @@
+package main.java.hello;
+
+/**
+ * HelloGradleKotlin
+ */
+public class HelloGradleKotlin {
+    private static final String HELLO_WORLD = "Hello World";
+
+    public static void main(String[] args) {
+        System.out.println(HELLO_WORLD);
+        System.out.println("test");
+        System.out.println("test4");
+        
+    }
+}