Add List_delete() definition

src/list.h

@@ -111,6 +111,23 @@ int List_insert(List *list, int index, int element);
  */
 int List_remove(List *list, int element);
 
+/*
+ *
+ * Description
+ * ----------------------------
+ *  Delete the element at the given index of the given list
+ *
+ * Params
+ * ----------------------------
+ *  *list       the list to remove the element at given index
+ *  index       the index to delete within the given list
+ *
+ * Returns
+ * ----------------------------
+ *  int (The deleted element)
+ */
+int List_delete(List *list, int index);
+
 /*
  *
  * Description