Add boilerplate code

.envrc

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+use flake

.gitignore

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+__pycache__/
+.direnv/

README.md

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-# ledger-unplugged-setup
-Tool to setup a Ledger Unplugged applet
+# Ledger Unplugged Setup
+
+Tool to setup the [Ledger Unplugged applet](https://github.com/VivoKey/apex-ledger-unplugged). To generate and install attestation certificates, please use [fido-attestation-loader](https://github.com/DangerousThings/fido-attestation-loader) in `ledger` mode.
+## Setup
+
+Install [Python 3](https://www.python.org/downloads/) and Pip (usually packaged with Python), both are probably available via your package manager. Use Pip in the terminal to install the requirements: 
+
+```
+pip install -r requirements.txt
+``` 
+
+Required modules are `cryptography`, `asn1`, and `pyscard`. The executable might also be called `pip3`. If you use NixOS, Flake and EnvRC files are provided.
+
+## Complete Commandline Reference
+
+Use `./setup.py -hd` to print this information.
+
+```
+
+```

flake.nix

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+{
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs";
+  };
+
+  outputs = { self, nixpkgs }:
+    let
+      pkgs = nixpkgs.legacyPackages.x86_64-linux;
+    in
+    {
+      devShell.x86_64-linux =
+        pkgs.mkShell {
+          shellHook = ''
+          '';
+
+          buildInputs = with pkgs; [
+            (python3.withPackages (ps: with ps; [
+              cryptography
+              asn1
+              pyscard
+            ]))
+          ];
+        };
+    };
+}

ledger.py

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+#!/usr/bin/env python3

requirements.txt

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+cryptography==37.0.4
+asn1==2.6.0
+pyscard==2.0.3