feat: adds davids savings account to bank atm

Author: Dadenaike251

lesson_17/bank/bank_app/src/main/java/com/codedifferently/lesson17/bank/BankAccount.java

@@ -0,0 +1,19 @@
+package com.codedifferently.lesson17.bank;
+
+import java.util.Set;
+
+/** Represents a savings account. */
+public class SavingAccount extends BankAccount {
+
+  /**
+   * Creates a new savings account.
+   *
+   * @param accountNumber The account number.
+   * @param owners The owners of the account.
+   * @param initialBalance The initial balance of the account.
+   * @return
+   */
+  public SavingAccount(String accountNumber, Set<Customer> owners, double initialBalance) {
+    super(accountNumber, owners, initialBalance);
+  }
+}