docs: add info about the oracle for USD1

Author: chechu

risk/resilient-price-oracle.md

@@ -107,6 +107,7 @@ The current list of correlated token oracles in Venus is:
 | Core | USDC | [Chainlink](https://bscscan.com/address/0x1B2103441A0A108daD8848D8F5d790e4D402921F) | - | - | |
 | Core | USDe | [RedStone](https://bscscan.com/address/0x8455EFA4D7Ff63b8BFD96AdD889483Ea7d39B70a) | [Chainlink](https://bscscan.com/address/0x1B2103441A0A108daD8848D8F5d790e4D402921F) | [Chainlink](https://bscscan.com/address/0x1B2103441A0A108daD8848D8F5d790e4D402921F) | Upper bound: 1.01. Lower bound: 0.99 |
 | Core | USDT | [Chainlink](https://bscscan.com/address/0x1B2103441A0A108daD8848D8F5d790e4D402921F) | - | - | |
+| Core | USD1 | [RedStone](https://bscscan.com/address/0x8455EFA4D7Ff63b8BFD96AdD889483Ea7d39B70a) | [Chainlink](https://bscscan.com/address/0x1B2103441A0A108daD8848D8F5d790e4D402921F) | [Chainlink](https://bscscan.com/address/0x1B2103441A0A108daD8848D8F5d790e4D402921F) | |
 | Core | UST | [Chainlink](https://bscscan.com/address/0x1B2103441A0A108daD8848D8F5d790e4D402921F) | - | - | |
 | Core | VAI | [Chainlink](https://bscscan.com/address/0x1B2103441A0A108daD8848D8F5d790e4D402921F) | - | - | |
 | Core | WBETH | [Chainlink](https://bscscan.com/address/0x1B2103441A0A108daD8848D8F5d790e4D402921F) | - | - | |