Added class Hints, including tests

src/Client/src/main/java/greenify/client/Hints.java

@@ -56,7 +56,7 @@ public class Hints {
     }
 
     /**
-     * This method gets a random hint from the list of hints.
+     * This method returns a random hint from the list of hints.
      * @return the random hint.
      */
     public String randomHint() {

src/Client/src/main/java/greenify/client/controller/DashBoardController.java

@@ -527,5 +527,5 @@ public class DashBoardController {
             button.setOnMouseExited(e -> scaleDown.playFromStart());
         }
     }
-
 }
+