Added source files.

Makefile

@@ -0,0 +1,14 @@
+AS=as
+LINKER=ld
+OBJ=src/HelloWorld.o
+
+%.o: %.asm
+	$(AS) -o $@ $<
+
+helloworld: $(OBJ)
+	$(LINKER) -o $@ $^
+
+.PHONY: clean
+
+clean:
+	rm $(OBJ)

src/HelloWorld.asm

@@ -0,0 +1,17 @@
+.section .data
+    hello:
+        .ascii "Hello, World.\n"
+
+.section .text
+    .global _start
+
+_start:
+    mov $1, %rax
+    mov $1, %rdi
+    mov $hello, %rsi
+    mov $14, %rdx
+    syscall
+
+    mov $60, %rax
+    xor %rdi, %rdi
+    syscall