separate declarations in libasm.h file and add list_push_front and list_size

srcs/bonus/ft_list_push_front.s

@@ -0,0 +1,29 @@
+global ft_list_push_front
+extern malloc
+
+section .text
+
+ft_list_push_front:
+	test rdi, rdi
+	je err
+
+	push rdi
+	push rsi
+	mov rdi, 10
+	call malloc wrt ..plt
+	pop rsi
+	pop rdi
+
+	test rax, rax ; did malloc return 0
+	je err
+
+	push rdi
+	mov rdi, [rdi]
+	mov [rax + 8], rdi ;set both settings
+	mov [rax], rsi
+	pop rdi
+
+	mov [rdi], rax
+	
+err:
+	ret