move code to src/test

* so that it compiles and tests pass
* fix some additional snip references in getting started

akka-docs/src/test/scala/docs/duration/Sample.scala

@@ -0,0 +1,26 @@
+/**
+ * Copyright (C) 2013-2017 Lightbend Inc. <http://www.lightbend.com>
+ */
+
+package docs.duration
+
+import language.postfixOps
+
+object Scala {
+  //#dsl
+  import scala.concurrent.duration._
+
+  val fivesec = 5.seconds
+  val threemillis = 3.millis
+  val diff = fivesec - threemillis
+  assert(diff < fivesec)
+  val fourmillis = threemillis * 4 / 3 // you cannot write it the other way around
+  val n = threemillis / (1 millisecond)
+  //#dsl
+
+  //#deadline
+  val deadline = 10.seconds.fromNow
+  // do something
+  val rest = deadline.timeLeft
+  //#deadline
+}