Add CryptoTradingAPI (#1927)

README.md

@@ -247,6 +247,7 @@ API | Description | Auth | HTTPS | CORS |
 | [CryptoCompare](https://www.cryptocompare.com/api#) | Cryptocurrencies Comparison | No | Yes | Unknown |
 | [CryptoMarket](https://developers.cryptomkt.com) | Cryptocurrencies Trading platform | `apiKey` | Yes | Yes |
 | [Cryptonator](https://www.cryptonator.com/api/) | Cryptocurrencies Exchange Rates | No | Yes | Unknown |
+| [CryptoTradingAPI](https://www.cryptotradingapi.io/) | Crypto Prices & Technical Indicators | `apiKey` | Yes | Unknown |
 | [Gemini](https://docs.gemini.com/rest-api/) | Cryptocurrencies Exchange | No | Yes | Unknown |
 | [ICObench](https://icobench.com/developers) | Various information on listing, ratings, stats, and more | `apiKey` | Yes | Unknown |
 | [MercadoBitcoin](https://www.mercadobitcoin.net/api-doc/) | Brazilian Cryptocurrency Information | No | Yes | Unknown |