Clean up XStream examples

xstream/src/main/java/com/baeldung/pojo/CustomerPortfolio.java

@@ -0,0 +1,20 @@
+package com.baeldung.pojo;
+
+import com.thoughtworks.xstream.annotations.XStreamAlias;
+
+import java.util.List;
+
+@XStreamAlias("CustomerPortfolio")
+public class CustomerPortfolio {
+
+    private List<CustomerAddressDetails> customerAddressDetailsList;
+
+    public List<CustomerAddressDetails> getCustomerAddressDetailsList() {
+        return customerAddressDetailsList;
+    }
+
+    public void setCustomerAddressDetailsList(List<CustomerAddressDetails> customerAddressDetailsList) {
+        this.customerAddressDetailsList = customerAddressDetailsList;
+    }
+
+}