f Add lightning-liquidtity as reference implementation

Author: tnull

blip-0052.md

@@ -22,6 +22,14 @@ LSPS2 requires [LSPS0/bLIP 50](./blip-0050.md) and therefore [BOLT8](https://git
 
 This bLIP is licensed under the MIT license.
 
+## Reference Implementation
+
+A reference implementation of this protocol can be found as part of the
+[`lightning-liquidity`][] crate.
+
+[`lightning-liquidity`]: https://github.com/lightningdevkit/rust-lightning/tree/main/lightning-liquidity
+
+
 ## Disclaimer
 
 > **Note** Nodes that naively prepayment probe can cause LSPs using LSPS2 to open channels early.