site: add cps to ressources

Author: will-break-it

site/docs/resources.md

@@ -8,6 +8,8 @@ This page provides a collection of resources on Ouroboros Leios, including techn
 
 ## Technical documentation
 
+- [Leios CPS](https://github.com/cardano-foundation/CPS/pull/18)
+
 - [Leios CIP](https://github.com/cardano-foundation/CIPs/pull/379) – the Cardano
   Improvement Proposal by Duncan Coutts, providing the rationale and a high-level
   design of the protocol