JAVA-1470 Move 10 articles to libraries-4 module

libraries-4/src/main/java/com/baeldung/jdeffered/manager/DeferredManagerDemo.java

@@ -0,0 +1,22 @@
+package com.baeldung.jdeffered.manager;
+
+import org.jdeferred.Deferred;
+import org.jdeferred.DeferredManager;
+import org.jdeferred.Promise;
+import org.jdeferred.impl.DefaultDeferredManager;
+import org.jdeferred.impl.DeferredObject;
+
+class DeferredManagerDemo {
+
+    public static void initiate() {
+        Deferred<String, String, String> deferred = new DeferredObject<>();
+        DeferredManager dm = new DefaultDeferredManager();
+        Promise<String, String, String> p1 = deferred.promise(), p2 = deferred.promise(), p3 = deferred.promise();
+        dm.when(p1, p2, p3).done((result) -> {
+            System.out.println("done");
+        }).fail((result) -> {
+            System.out.println("fail");
+        });
+        deferred.resolve("Hello Baeldung");
+    }
+}