Add cryptocurrencies

[ivanjpg]

It would be great if you could add some cryptocurrencies to the list. Here I have the first 19.

I think the flag stuff should be modified to hold images also instead of the current String? variable type. Also, the icons should be retrieved from assets I think.

Thank you for your nice work.

  // Below this comment there are the main cryptocurrencies as listed by
  // https://www.coindesk.com/coindesk20/
  // All of these are based on the USD attributes.
  {
    "code": "BTC",
    "name": "Bitcoin",
    "symbol": "\$",
    "decimal_digits": 2,
    "number": -1,
    "name_plural": "Bitcoins",
    "thousands_separator": ",",
    "decimal_separator": ".",
    "space_between_amount_and_symbol": false,
    "symbol_on_left": true,
  },
  {
    "code": "ETH",
    "name": "Ethereum",
    "symbol": "\$",
    "decimal_digits": 2,
    "number": -1,
    "name_plural": "Ethereums",
    "thousands_separator": ",",
    "decimal_separator": ".",
    "space_between_amount_and_symbol": false,
    "symbol_on_left": true,
  },
  {
    "code": "USDT",
    "name": "Tether",
    "symbol": "\$",
    "decimal_digits": 2,
    "number": -1,
    "name_plural": "Tethers",
    "thousands_separator": ",",
    "decimal_separator": ".",
    "space_between_amount_and_symbol": false,
    "symbol_on_left": true,
  },
  {
    "code": "USDC",
    "name": "USD Coin",
    "symbol": "\$",
    "decimal_digits": 2,
    "number": -1,
    "name_plural": "USD Coins",
    "thousands_separator": ",",
    "decimal_separator": ".",
    "space_between_amount_and_symbol": false,
    "symbol_on_left": true,
  },
  {
    "code": "XRP",
    "name": "XRP",
    "symbol": "\$",
    "decimal_digits": 2,
    "number": -1,
    "name_plural": "XRPs",
    "thousands_separator": ",",
    "decimal_separator": ".",
    "space_between_amount_and_symbol": false,
    "symbol_on_left": true,
  },
  {
    "code": "SOL",
    "name": "Solana",
    "symbol": "\$",
    "decimal_digits": 2,
    "number": -1,
    "name_plural": "Solanas",
    "thousands_separator": ",",
    "decimal_separator": ".",
    "space_between_amount_and_symbol": false,
    "symbol_on_left": true,
  },
  {
    "code": "ADA",
    "name": "Cardano",
    "symbol": "\$",
    "decimal_digits": 2,
    "number": -1,
    "name_plural": "Cardanos",
    "thousands_separator": ",",
    "decimal_separator": ".",
    "space_between_amount_and_symbol": false,
    "symbol_on_left": true,
  },
  {
    "code": "XLM",
    "name": "Stellar",
    "symbol": "\$",
    "decimal_digits": 2,
    "number": -1,
    "name_plural": "Stellars",
    "thousands_separator": ",",
    "decimal_separator": ".",
    "space_between_amount_and_symbol": false,
    "symbol_on_left": true,
  },
  {
    "code": "DOGE",
    "name": "Dogecoin",
    "symbol": "\$",
    "decimal_digits": 2,
    "number": -1,
    "name_plural": "Dogecoins",
    "thousands_separator": ",",
    "decimal_separator": ".",
    "space_between_amount_and_symbol": false,
    "symbol_on_left": true,
  },
  {
    "code": "DOT",
    "name": "Polkadot",
    "symbol": "\$",
    "decimal_digits": 2,
    "number": -1,
    "name_plural": "Polkadots",
    "thousands_separator": ",",
    "decimal_separator": ".",
    "space_between_amount_and_symbol": false,
    "symbol_on_left": true,
  },
  {
    "code": "AVAX",
    "name": "Avalanche",
    "symbol": "\$",
    "decimal_digits": 2,
    "number": -1,
    "name_plural": "Avalanches",
    "thousands_separator": ",",
    "decimal_separator": ".",
    "space_between_amount_and_symbol": false,
    "symbol_on_left": true,
  },
  {
    "code": "LINK",
    "name": "Chainlink",
    "symbol": "\$",
    "decimal_digits": 2,
    "number": -1,
    "name_plural": "Chainlinks",
    "thousands_separator": ",",
    "decimal_separator": ".",
    "space_between_amount_and_symbol": false,
    "symbol_on_left": true,
  },
  {
    "code": "SHIB",
    "name": "Shiba Inu",
    "symbol": "\$",
    "decimal_digits": 2,
    "number": -1,
    "name_plural": "Shiba Inus",
    "thousands_separator": ",",
    "decimal_separator": ".",
    "space_between_amount_and_symbol": false,
    "symbol_on_left": true,
  },
  {
    "code": "MATIC",
    "name": "Polygon",
    "symbol": "\$",
    "decimal_digits": 2,
    "number": -1,
    "name_plural": "Polygons",
    "thousands_separator": ",",
    "decimal_separator": ".",
    "space_between_amount_and_symbol": false,
    "symbol_on_left": true,
  },
  {
    "code": "ATOM",
    "name": "Cosmos",
    "symbol": "\$",
    "decimal_digits": 2,
    "number": -1,
    "name_plural": "Cosmos",
    "thousands_separator": ",",
    "decimal_separator": ".",
    "space_between_amount_and_symbol": false,
    "symbol_on_left": true,
  },
  {
    "code": "GALA",
    "name": "Gala",
    "symbol": "\$",
    "decimal_digits": 2,
    "number": -1,
    "name_plural": "Galas",
    "thousands_separator": ",",
    "decimal_separator": ".",
    "space_between_amount_and_symbol": false,
    "symbol_on_left": true,
  },
  {
    "code": "MANA",
    "name": "Decentraland",
    "symbol": "\$",
    "decimal_digits": 2,
    "number": -1,
    "name_plural": "Decentralands",
    "thousands_separator": ",",
    "decimal_separator": ".",
    "space_between_amount_and_symbol": false,
    "symbol_on_left": true,
  },
  {
    "code": "LRC",
    "name": "Loopring",
    "symbol": "\$",
    "decimal_digits": 2,
    "number": -1,
    "name_plural": "Looprings",
    "thousands_separator": ",",
    "decimal_separator": ".",
    "space_between_amount_and_symbol": false,
    "symbol_on_left": true,
  },
  {
    "code": "LUNA",
    "name": "Luna Classic",
    "symbol": "\$",
    "decimal_digits": 2,
    "number": -1,
    "name_plural": "Luna Classics",
    "thousands_separator": ",",
    "decimal_separator": ".",
    "space_between_amount_and_symbol": false,
    "symbol_on_left": true,
  }