code: public static <S> Transition<Void,S> create(S fromState, S toState){
          return new Transition<Void, S>(fromState, null, toState);
      }
docs: Offers a way to instantiate a transition without specifying an action but
  only the origin and destination states.
  
  @param fromState state origin of the transition
  @param toState state destination of the transition
  @param <S> type of the state
  @return instance of a transition with an origin and destination, but without an action