Merge pull request #3853 from jaybuidl/docs-oracles-kleros

Docs: added the kleros oracle to the supporter guide

docs/src/content/hardhat-runner/docs/supporter-guides/oracles.md

@@ -216,6 +216,8 @@ There are multiple oracle applications you can integrate into your dapp:
 
 - [Witnet](https://witnet.io/) - _Witnet is a permissionless, decentralized, and censorship-resistant oracle helping smart contracts to react to real world events with strong crypto-economic guarantees._
 
+- [Kleros Oracle](https://kleros.io/oracle) - _Crowd-sourced on-chain smart contract oracle in collaboration with the Reality.eth cryptoeconomic mechanism for verifying real-world events on-chain, a subjective oracle solution able to answer any question with a publicly verifiable answer._
+
 - [UMA Oracle](https://umaproject.org/products/optimistic-oracle) - _UMA's optimistic oracle allows smart contracts to quickly and receive any kind of data for different applications, including insurance, financial derivatives, and prediction market._
 
 - [Tellor](https://tellor.io/) - _Tellor is a transparent and permissionless oracle protocol for your smart contract to easily get any data whenever it needs it._