update 3/readme

Author: heracliteanflux

3_CustomerLoanAccount/README.md

@@ -5,6 +5,7 @@
 1. [Execution at the command line](#execution-at-the-command-line)
 2. [`Customer` Class](#customer-class)
 3. [`CustomerLoanAccount` Class](#customerloanaccount-class)
+4. [Requirements](#requirements)
 
 #### Execution at the command line
 
@@ -152,4 +153,50 @@ public class CustomerLoanAccount extends Object {
     }
   }
 }
+```
+
+#### Requirements
+
+Enhance the Loan Accounts Hierarchy from project `2_LoanAccountHierarchy` by adding a `Customer` class with the following properties and methods:
+* property `firstName` the customer's first name (`String`)
+* property `lastName` the customer's last name (`String`)
+* property `SSN` the customer's SSN (`String`)
+* property `loanAccounts` an array list of loan accounts (`ArrayList<LoanAccount>`)
+* a constructor that accepts `firstName`, `lastName`, and `SSN` as parameters
+* getters for `firstName`, `lastName`, and `SSN`
+* method `addLoanAccount(LoanAccount account)` adds a loan to the array list of loans for this customer
+* method `printMonthlyReport()` prints all the information for all the accounts of this `Customer` and utilizes the `toString()` method of the corresponding loan class
+
+Use the following code in the main function to test the classes:
+
+```java
+CarLoan         carLoan1         = new CarLoan(25_000.00, 4.9, 72, "IRQ3458977");
+Address         propertyAddress1 = new Address("321 Main Street", "State College", "PA", "16801");
+PrimaryMortgage propertyLoan1    = new PrimaryMortgage(250_000.00, 3.75, 360, 35.12, propertyAddress1);
+UnsecuredLoan   unsecuredLoan    = new UnsecuredLoan(5_000.00, 10.75, 48);
+
+CarLoan         carLoan2         = new CarLoan(12_000.00, 5.0, 60, "NXK6767876");
+Address         propertyAddress2 = new Address("783 Maple Lane", "State College", "PA", "16801");
+PrimaryMortgage propertyLoan2    = new PrimaryMortgage(375_000.00, 2.50, 360, 53.12, propertyAddress2);
+
+Customer customerA = new Customer("Tony", "Stark", "111-22-3333");
+Customer customerB = new Customer( "Gal", "Gadot", "444-55-6666");
+
+customerA.addLoanAccount(carLoan1);
+customerA.addLoanAccount(propertyLoan1);
+customerA.addLoanAccount(unsecuredLoan);
+
+customerB.addLoanAccount(carLoan2);
+customerB.addLoanAccount(propertyLoan2);
+
+// add the customers to an arraylist of customers
+ArrayList<Customer> customers = new ArrayList<>();
+customers.add(customerA);
+customers.add(customerB);
+
+// print the loan information for each customer polymorhically
+System.out.println("Monthly Report of Customers by Loan Account");
+for (Customer customer : customers) {
+	customer.printMonthlyReport();
+}
 ```