Add in nix packaging (#1)

* Add in nix packaging

* include stdint

* Fixes the PRs

hbas.c

@@ -23,6 +23,7 @@ SOFTWARE.
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <stdint.h>
 
 void hd(char *data, size_t len) {
     for (size_t ii = 0; ii < len; ii += 1) {

run.sh

@@ -0,0 +1,2 @@
+make CC=clang
+./hbas < example.S > example.hbf

shell.nix

@@ -0,0 +1,9 @@
+{ pkgs ? import <nixpkgs> { } }:
+pkgs.mkShell rec {
+  buildInputs = with pkgs; [
+    clang
+  ];
+  shellHook = ''
+    export CC=clang
+  '';
+}