Add coinpaprika API (public-apis#796)

Author: wrwr

README.md

@@ -178,6 +178,7 @@ API | Description | Auth | HTTPS | CORS |
 | [Coinigy](https://coinigy.docs.apiary.io) | Interacting with Coinigy Accounts and Exchange Directly | `apiKey` | Yes | Unknown |
 | [CoinLayer](https://coinlayer.com) | Real-time Crypto Currency Exchange Rates | `apiKey` | Yes | Unknown |
 | [CoinMarketCap](https://coinmarketcap.com/api/) | Cryptocurrencies Prices | No | Yes | Unknown |
+| [Coinpaprika](https://api.coinpaprika.com) | Cryptocurrencies prices, volume and more | No | Yes | Yes |
 | [CryptoCompare](https://www.cryptocompare.com/api#) | Cryptocurrencies Comparison | No | Yes | Unknown |
 | [Cryptonator](https://www.cryptonator.com/api/) | Cryptocurrencies Exchange Rates | No | Yes | Unknown |
 | [Livecoin](https://www.livecoin.net/api) | Cryptocurrency Exchange | No | Yes | Unknown |