added isEmpty method for Linked List
corrected error in Node, next needed to be another Node, not an Object. Also added size method to LinkedList. needs to call another method which finds the size recursively. Doesnt seem very efficient to have to create a whole new method to make size method, but as size doesnt take parameters dont know how to implement it without another method that takes node as parameter
added getElement method to Node which will be necessary in the get method in LinkedList
added more to get method and created another method to get value recursively