added lesson 8

src/Lesson8/Actors.scala

@@ -0,0 +1,19 @@
+package Lesson8
+
+import akka.actor.{Actor, ActorSystem, Props}
+
+object Actors extends App {
+  case class Greetings(who: String)
+
+  class SimplestActor extends Actor {
+    def receive = {
+      case Greetings(who) => println(s"Hello $who, pleased to meet you")
+    }
+  }
+
+  val system = ActorSystem("MySystem")
+  val simple_greeter = system.actorOf(Props[SimplestActor])
+
+  simple_greeter ! Greetings("Dr Who")
+}
+

src/Lesson8/Futures.scala

@@ -0,0 +1,18 @@
+package Lesson8
+
+import scala.concurrent.Future
+import scala.util.{Failure, Success}
+
+object Futures extends App {
+  implicit val ec: scala.concurrent.ExecutionContext = scala.concurrent.ExecutionContext.global
+
+  val f: Future[Int] = Future {
+    Thread.sleep(650)
+    3 + 4
+  }
+
+  f onComplete {
+    case Success(x: Int) => println(s"Computing done, result is $x")
+    case Failure(ex) => println("Error")
+  }
+}