Add stage 1: assembly

src/1_assembly.S

@@ -0,0 +1,18 @@
+global _1_assembly_func
+section   .text
+; _start:   mov       rax, 1                  ; system call for write
+          ; mov       rdi, 1                  ; file handle 1 is stdout
+          ; mov       rsi, message            ; address of string to output
+          ; mov       rdx, 13                 ; number of bytes
+          ; syscall                           ; invoke operating system to do the write
+          ; mov       rax, 60                 ; system call for exit
+          ; xor       rdi, rdi                ; exit code 0
+          ; syscall                           ; invoke operating system to exit
+
+_1_assembly_func:
+	mov rax, message
+	ret
+	
+section   .data
+
+message:  db        "Hello from Assembly.", 21      ; note the newline at the end; Define variables in the data section