Add SmartAPI (#2503)

README.md

@@ -612,6 +612,7 @@ API | Description | Auth | HTTPS | CORS |
 | [Polygon](https://polygon.io/) | Historical stock market data | `apiKey` | Yes | Unknown |
 | [Razorpay IFSC](https://ifsc.razorpay.com/) | Indian Financial Systems Code (Bank Branch Codes) | No | Yes | Unknown |
 | [Real Time Finance](https://github.com/Real-time-finance/finance-websocket-API/) | Websocket API to access realtime stock data | `apiKey` | No | Unknown |
+| [SmartAPI](https://smartapi.angelbroking.com/) | Gain access to set of <SmartAPI> and create end-to-end broking services | `apiKey` | Yes | Unknown |
 | [StockData](https://www.StockData.org) | Real-Time, Intraday & Historical Market Data, News and Sentiment API | `apiKey` | Yes | Yes |
 | [Styvio](https://www.Styvio.com) | Realtime and historical stock data and current stock sentiment | No | Yes | Unknown |
 | [Tradier](https://developer.tradier.com) | US equity/option market data (delayed, intraday, historical) | `OAuth` | Yes | Yes |