add other basic functions and test with them

srcs/ft_read.s

@@ -0,0 +1,19 @@
+global ft_read
+extern __errno_location
+section .text
+
+ft_read:
+	mov rax, 0 ;syscall number for read, args are already set at the right place
+	syscall
+
+	cmp rax, 0 ; if return is < 0, it's an error in negative
+	jg success
+
+	neg rax ; inv errno, and set errno
+	mov edi, eax
+	call __errno_location wrt ..plt
+	mov [rax], edi
+	mov rax, -1
+
+success:
+	ret