Update index.md

Author: ESchouten

docs/content/Examples/index.md

@@ -5,4 +5,5 @@ Here you can find some example projects using this library:
 1. An article about pairing Kotlin and GraphQL together using http4k [Medium Article](https://medium.com/@pagakrivos/graphql-and-kotlin-e5d17162d169) | [GitHub repo](https://github.com/pagidas/kgraphql-http4k-demo)
 1. Demo using Spring Boot: [KGraphQL-NBA2012](https://github.com/pgutkowski/KGraphQL-NBA2012)
 1. A social network built with KGraphQL: [WheresMyDuo](https://github.com/NathanPB/WheresMyDuo)
+1. Clean Architecture based backend: [CleanArchitecture](https://github.com/ESchouten/CleanArchitecture)
 1. *Please add your own project to this list*