Enhance Real-Time APIs for Stocks

- Add the APIs to get real-time APIs for Stocks, Currencies, and Crypto.

README.md

@@ -580,6 +580,7 @@ API | Description | Auth | HTTPS | CORS |
 | [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 |
+| [Finnhub](https://finnhub.io/docs/api) | Real-Time RESTful APIs and Websocket for Stocks, Currencies, and Crypto | `apiKey` | Yes | Unknown |
 | [FRED](https://fred.stlouisfed.org/docs/api/fred/) | Economic data from the Federal Reserve Bank of St. Louis | `apiKey` | Yes | Yes |
 | [Hotstoks](https://hotstoks.com?utm_source=public-apis) | Stock market data powered by SQL | `apiKey` | Yes | Yes |
 | [IEX Cloud](https://iexcloud.io/docs/api/) | Realtime & Historical Stock and Market Data | `apiKey` | Yes | Yes |