Add nix-shell and direnv goodness

Signed-off-by: Manuel Mendez <[email protected]>

Author: mmlb

.envrc

@@ -0,0 +1,4 @@
+has nix && use nix
+dotenv_if_exists
+PATH_add bin
+path_add GOBIN bin

shell.nix

@@ -0,0 +1,23 @@
+let _pkgs = import <nixpkgs> { };
+in { pkgs ? import (_pkgs.fetchFromGitHub {
+  owner = "NixOS";
+  repo = "nixpkgs";
+  #branch@date: nixpkgs-unstable@2021-11-12
+  rev = "2fbba4b4416446721ebfb2e0bfcc9e45d8ddb4d2";
+  sha256 = "1yw2p38pdvx63n21g6pmn79xjpxa93p1qpcadrlmg0j0zjnxkwr8";
+}) { } }:
+
+with pkgs;
+
+mkShell {
+  buildInputs = [
+    git
+    gnumake
+    go
+    nixfmt
+    nodePackages.prettier
+    python3Packages.pip
+    python3Packages.setuptools
+    python3Packages.wheel
+  ];
+}