feat: Makefile and test main

Makefile

@@ -0,0 +1,27 @@
+NAME = libasm
+
+SRC = ft_strlen.s
+
+OBJ = $(SRC:.s=.o)
+
+%.o:%.s
+	nasm -f elf64 $< -o $@
+
+all: $(NAME)
+
+$(NAME): $(OBJ)
+	ar rcs libasm.a $(OBJ)
+
+test: $(NAME)
+	gcc -Wall -Werror -Wextra main.c -L. -lasm -o libasm_unit_tests
+
+clean:
+	rm $(OBJ)
+
+fclean:
+	rm libasm.a
+	rm libasm_unit_tests
+
+re: fclean all
+
+.PHONY: all test

libasm.h

@@ -0,0 +1,8 @@
+#ifndef _LIBASM_H
+# define _LIBASM_H
+
+#include <stdio.h>
+
+ssize_t ft_strlen(const char *);
+
+#endif

main.c

@@ -0,0 +1,6 @@
+#include "libasm.h"
+
+int main() {
+	printf("%ld\n", ft_strlen("c'est moi la chaine de 36 caracteres"));
+	return 0;
+}