Add initial working draft

At this point, there's still a lot of filler and FIXMEs, but we do have
a complete bulletin generating!

shell.nix

@@ -0,0 +1,13 @@
+let
+  pkgs = import <nixpkgs> { config = {}; overlays = []; };
+in
+pkgs.mkShellNoCC {
+  packages = with pkgs; [
+    gnumake
+    lilypond
+    (pkgs.texlive.combine {
+      inherit (pkgs.texlive) scheme-basic
+      scripture xcolor lipsum;
+    })
+  ];
+}