add Game.currentState to indicate whether games are won/lost

Webservice/Player.js

@@ -8,9 +8,6 @@ class Player {
     move_by(amount) {
         this.position += amount;
         //todo: move by 1 only on the last 3 fields
-        if (this.position >= 16) {
-            // todo: win
-        }
     }
 }