add authors

spec/app/ics-028-cross-chain-validation/README.md

@@ -4,9 +4,9 @@ title: Cross-Chain Validation
 stage: draft
 category: IBC/APP
 requires: 25, 26, 20
-author: 
-created: 
-modified: 
+author: Marius Poke <[email protected]>, Aditya Sripal <[email protected]>, Jovan Komatovic <[email protected]>, Cezara Dragoi <[email protected]>, Josef Widder <[email protected]>
+created: 2022-06-24
+modified: 2022-06-24
 ---
 
 <!-- omit in toc -->
@@ -35,18 +35,22 @@ The communication between the provider and the consumer chains is done through t
 
 ## Forwards Compatibility
 
+-->
+
 ## Example Implementation
 
-(link to or description of concrete example implementation)
+Interchain Security [Go implementation](https://github.com/cosmos/interchain-security).
+
 
+<!--
 ## Other Implementations
 
 (links to or descriptions of other implementations)
 
 ## History
 
 (changelog and notable inspirations / references)
- -->
+-->
 
 ## Copyright