feat: adds AuditLog and MoneyOrder classes

Author: AmiyahJo

lesson_17/bank/bank_app/src/test/java/com/codedifferently/lesson17/bank/AuditLog.java

@@ -0,0 +1,7 @@
+package com.codedifferently.lesson17.bank;
+
+public class AuditLog {
+    public void logTransaction(String message) {
+        System.out.println(message);
+    }
+}

lesson_17/bank/bank_app/src/test/java/com/codedifferently/lesson17/bank/MoneyOrder.java

@@ -0,0 +1,7 @@
+package com.codedifferently.lesson17.bank;
+
+public class MoneyOrder {
+    public MoneyOrder(Account sourceAccount, double amount) {
+        sourceAccount.withdraw(amount);
+    }
+}