build: Add shell.nix to build in nixos

Signed-off-by: Siddharth Chandrasekaran <sidcha.dev@gmail.com>

Author: sidcha

shell.nix

@@ -0,0 +1,9 @@
+{ pkgs ? import <nixpkgs> {} }:
+
+pkgs.mkShell {
+  hardeningDisable = [ "fortify" ];
+  buildInputs = with pkgs; [
+    clang
+  ];
+  LIBCLANG_PATH = "${pkgs.libclang.lib}/lib";
+}