feat: added lst structure

srcs/lst/ft_lstnew.c

@@ -0,0 +1,14 @@
+#include "libft.h"
+
+t_list *ft_lstnew(void *data)
+{
+    t_list *node = (t_list *)malloc(sizeof(t_list));
+
+    if (!node)
+        return (NULL);
+
+    node->data = data;
+    node->next = NULL;
+
+    return node;
+}