Added single line comments

examples/hello/hello.q

@@ -1,3 +1,4 @@
+// Comment
 main() {
 	address := 4194304 + 1
 	length := (0 + 50 - 20) * 10 / 100
@@ -7,10 +8,12 @@ main() {
 	}
 }
 
+// Comment
 print(address, length) {
 	write(length-2, address, length)
 }
 
+// Comment
 write(fd, address, length) {
 	syscall(1, fd, address, length)
 }