Merge branch 'backend/nfc' into 'master'

# PoolPay Card Interface

This package contains code to interface with NFC cards, namely Pool Cards.

It forms part of the larger PoolPay application, but can also be run as a standalone module (primarily for experimenting purposes).

## Run as standalone module

Execute the following lines in the base repository directory:

```bash

source venv/bin/activate

python3 -m poolpay.card id

```

import argparse

from poolpay.card.CardReader import CardReader

from poolpay.card.Mfrc522CardReader import Mfrc522CardReader

READERS = {

    "mfrc522": Mfrc522CardReader,

}

DEFAULT_READER = "mfrc522"

def action_id(reader: CardReader) -> None:

    card_id = reader.read_id()

    print("Card ID (base 10)", card_id)

    print("Card ID (base 16)", [hex(i) for i in card_id])

ACTIONS = {"id": action_id}

def parse_args() -> argparse.Namespace:

    parser = argparse.ArgumentParser(

        prog="poolpay.card", description="Experimental util to interface with NFC cards"

    )

    parser.add_argument(

        "action",

        choices=["id"],

        help="the action to be done (currently, must always be 'id')",

    )

    parser.add_argument(

        "-u",

        "--using",

        choices=READERS.keys(),

        default=DEFAULT_READER,

        help="the reader class to be used",

    )

    return parser.parse_args()

# Parse the command line arguments

args = parse_args()

# Retrieve the requested reader class from the dictionary and create an instance

reader = READERS[args.using]()

# Call the selected action

ACTIONS[args.action](reader)