feat: added notification pattern (#2629)

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

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

@@ -0,0 +1,26 @@
+package com.iluwatar;
+
+import java.time.LocalDate;
+
+/**
+ * The notification pattern captures information passed between layers, validates the information, and returns
+ * any errors to the presentation layer if needed.
+ *
+ * <p>In this code, this pattern is implemented through the example of a form being submitted to register
+ * a worker. The worker inputs their name, occupation, and date of birth to the RegisterWorkerForm (which acts
+ * as our presentation layer), and passes it to the RegisterWorker class (our domain layer) which validates it.
+ * Any errors caught by the domain layer are then passed back to the presentation layer through the
+ * RegisterWorkerDto.</p>
+ */
+public class App {
+
+  private static final String NAME = "";
+  private static final String OCCUPATION = "";
+  private static final LocalDate DATE_OF_BIRTH = LocalDate.of(2016, 7, 13);
+
+  public static void main(String[] args) {
+    var form = new RegisterWorkerForm(NAME, OCCUPATION, DATE_OF_BIRTH);
+    form.submit();
+  }
+
+}