bscscan Explorer added in Blockchain Category (#335)

Co-authored-by: Hello World <[email protected]>

README.md

@@ -234,6 +234,7 @@
 | API | Description | Auth | HTTPS | CORS |
 |---|---|---|---|---|
 | [Bitquery](https://graphql.bitquery.io/ide) | Onchain GraphQL APIs & DEX APIs | `apiKey` | Yes | Yes |
+| [Bscscan](https://bscscan.com/apis) | Binance Smart Chain explorer API | `apiKey` | Yes | Yes |
 | [Chainlink](https://chain.link/developer-resources) | Build hybrid smart contracts with Chainlink | No | Yes | Unknown |
 | [Chainpoint](https://tierion.com/chainpoint/) | Chainpoint is a global network for anchoring data to the Bitcoin blockchain | No | Yes | Unknown |
 | [Covalent](https://www.covalenthq.com/docs/api/) | Multi-blockchain data aggregator platform | `apiKey` | Yes | Unknown |