add file for constantpool (#10442)

* Create ConstantPool.java

add file for constantpool

* update the module with most relevant

update the module with most relevant

core-java-modules/core-java-jvm-2/src/main/java/com/baeldung/constantpool/ConstantPool.java

@@ -0,0 +1,8 @@
+package com.baeldung.constantpool;
+
+public class ConstantPool {
+    
+    public void sayHello() {
+        System.out.println("Hello World");
+    }
+}