JAVA-1470 Move 10 articles to libraries-4 module

libraries-4/src/main/java/com/baeldung/jdeffered/PromiseDemo.java

@@ -0,0 +1,21 @@
+package com.baeldung.jdeffered;
+
+import org.jdeferred.Deferred;
+import org.jdeferred.Promise;
+import org.jdeferred.impl.DeferredObject;
+
+class PromiseDemo {
+
+    static void startJob(String jobName) {
+
+        Deferred<String, String, String> deferred = new DeferredObject<>();
+        Promise<String, String, String> promise = deferred.promise();
+
+        promise.done(result -> System.out.println("Job done")).fail(rejection -> System.out.println("Job fail")).progress(progress -> System.out.println("Job is in progress")).always((state, result, rejection) -> System.out.println("Job execution started"));
+
+        deferred.resolve(jobName);
+        // deferred.notify("");
+        // deferred.reject("oops");
+    }
+
+}