Update xAccount RFP in README.md (#63)

rfps/README.md

@@ -11,7 +11,7 @@ If you find an open RFP here that you think you can address, feel free to submit
 We are looking for (additional) teams to implement this.
 
 - [Use cases and applications that use Darwinia Msgport](https://docs.darwinia.network/msgport/overview/)
-- [Use cases and applications that use Msgport xAccount]()
+- [Use cases and applications that use Msgport xAccount](https://github.com/darwinia-network/darwinia-msgport/tree/main/src/xAccount)
 - [Use cases and applications that use Helix xToken](https://docs.helixbridge.app/helixbridge/mapping_token)
 - [Uniswap V3 like DEX](https://support.uniswap.org/hc/en-us/articles/14569783029645-Uniswap-v3-Licensing)
 - [Integration Solutions](https://github.com/orgs/dcdao/discussions/categories/integration)