feat: Adds BankATM.java unfinished

Author: Ananatawa

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

@@ -6,6 +6,19 @@
 import java.util.Set;
 import java.util.UUID;
 
+public class AuditLog {
+    private static List<String> logEntries = new ArrayList<>();
+
+    public static void record(String message) {
+        logEntries.add(message);
+        System.out.println("LOG: " + message);
+    }
+
+    public static List<String> getLog() {
+        return logEntries;
+    }
+}
+
 /** Represents a bank ATM. */
 public class BankAtm {
 
@@ -86,3 +99,4 @@ private CheckingAccount getAccountOrThrow(String accountNumber) {
     return account;
   }
 }
+