fwrite - write to file
fread - write from file
pushBack - push element to the end
pushFront - push element to the begining
popBack - delete element from the end
popFront - delete element from the end
getSize - print size
printList - print all list
read - print the value of a specific index
search - print the index of value
insert - insert value to specific place
delete - delete the value of a specific index
exit - extit from the program