Inserts the contents of the stack at the beginning of L1 (at index 0) and shifts the index of all other elements in the list up by the number of elements on the stack.

#prepends the stack to the beginning of list01
"Hello" "Creeper" "World" <-list01 PrependStackToList

Sample list01:
0 - foo
1 - bar

Sample list01 after PrependToList command:
0 - Hello
1 - Creeper
2 - World
3 - foo
4 - bar