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Add At In Doubly Linkedlist

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1. You are given a partially written DoublyLinkedList class.
2. You are required to complete the body of AddAt function. This function is supposed to add value at given index. 
3. If size of list is zero then return "ListIsEmpty: -1".
4. If Inddex is Invalid then return "IndexIsInValid: -1". 
5. You are required to update head, tail and size as required.
6. Input and Output is managed for you. Just update the code in  incomplete function.

Note -> Use the code snippet and follow the algorithm discussed in question video. The judge can't 
        force you but the intention is to teach a concept. Play in spirit of the question.
Input Format 
input in managed for you.
Output Format 
output in managed for you.
Question Video
Constraints 
0 <= N <= 10^6
Sample Input 
addFirst 4
addFirst 4
addLast 5
addFirst 7
getAt 4 3
addAt 4 34
addAt 0 43
addAt 8 545
addLast 1
removeFirst
removeFirst
size
isEmpty
getFirst
removeFirst
removeLast
getLast
removeFirst
removeFirst
addAt 0 345
stop
Sample Output 
IndexIsInValid: -1
IndexIsInValid: -1
43
7
5
false
4
4
1
34
4
5
[345, 34]


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