Adding hello world for setup instructions

Author: cutajarj

src/main/java/com/packt/datastructuresandalg/setup/HelloWorld.java

@@ -0,0 +1,11 @@
+package com.packt.datastructuresandalg.setup;
+
+public class HelloWorld {
+    public String seyHello() {
+        return "Hello World!";
+    }
+
+    public static void main(String []args) {
+        System.out.println((new HelloWorld()).seyHello());
+    }
+}

src/test/java/com/packt/datastructuresandalg/setup/HelloWorldTest.java

@@ -0,0 +1,10 @@
+package com.packt.datastructuresandalg.setup;
+
+import junit.framework.TestCase;
+
+public class HelloWorldTest extends TestCase {
+    public void testHelloWorld() {
+        HelloWorld helloWorld = new HelloWorld();
+        assertEquals(helloWorld.seyHello(), "Hello World!");
+    }
+}