Add Citi (#2570)

README.md

@@ -608,6 +608,7 @@ API | Description | Auth | HTTPS | CORS |
 | [Alpha Vantage](https://www.alphavantage.co/) | Realtime and historical stock data | `apiKey` | Yes | Unknown |
 | [apilayer marketstack](https://marketstack.com/) | Real-Time, Intraday & Historical Market Data API | `apiKey` | Yes | Unknown |
 | [Banco do Brasil](https://developers.bb.com.br/home) | All Banco do Brasil financial transaction APIs | `OAuth` | Yes | Yes |
+| [Citi](https://sandbox.developerhub.citi.com/api-catalog-list) | All Citigroup account and statement data APIs | `apiKey` | Yes | Unknown |
 | [Econdb](https://www.econdb.com/api/) | Global macroeconomic data | No | Yes | Yes |
 | [Fed Treasury](https://fiscaldata.treasury.gov/api-documentation/) | U.S. Department of the Treasury Data | No | Yes | Unknown |
 | [Financial Modeling Prep](https://financialmodelingprep.com/developer/docs/) | Realtime and historical stock data | `apiKey` | Yes | Unknown |