feat: added notification pattern (#2629)

Co-authored-by: Ilkka Seppälä <iluwatar@users.noreply.github.com>

notification/src/main/java/com/iluwatar/RegisterWorkerDto.java

@@ -0,0 +1,59 @@
+package com.iluwatar;
+
+import java.time.LocalDate;
+import lombok.Getter;
+import lombok.Setter;
+
+/**
+ * Data transfer object which stores information about the worker. This is carried between
+ * objects and layers to reduce the number of method calls made.
+ */
+@Getter
+@Setter
+public class RegisterWorkerDto extends DataTransferObject {
+  private String name;
+  private String occupation;
+  private LocalDate dateOfBirth;
+
+  /**
+   * Error for when name field is blank or missing.
+   */
+  public static final NotificationError MISSING_NAME =
+          new NotificationError(1, "Name is missing");
+
+  /**
+   * Error for when occupation field is blank or missing.
+   */
+  public static final NotificationError MISSING_OCCUPATION =
+          new NotificationError(2, "Occupation is missing");
+
+  /**
+   * Error for when date of birth field is blank or missing.
+   */
+  public static final NotificationError MISSING_DOB =
+          new NotificationError(3, "Date of birth is missing");
+
+  /**
+   * Error for when date of birth is less than 18 years ago.
+   */
+  public static final NotificationError DOB_TOO_SOON =
+          new NotificationError(4, "Worker registered must be over 18");
+
+
+  protected RegisterWorkerDto() {
+    super();
+  }
+
+  /**
+   * Simple set up function for capturing our worker information.
+   *
+   * @param name        Name of the worker
+   * @param occupation  occupation of the worker
+   * @param dateOfBirth Date of Birth of the worker
+   */
+  public void setupWorkerDto(String name, String occupation, LocalDate dateOfBirth) {
+    this.name = name;
+    this.occupation = occupation;
+    this.dateOfBirth = dateOfBirth;
+  }
+}