Add hackernews graphql api tutorial to other resources (#2305)

README.md

@@ -148,3 +148,4 @@ There isn't any way around this, gqlgen has no way to know what you want in a gi
 - [Introducing gqlgen: a GraphQL Server Generator for Go](https://99designs.com.au/blog/engineering/gqlgen-a-graphql-server-generator-for-go/)
 - [Dive into GraphQL by Iván Corrales Solera](https://medium.com/@ivan.corrales.solera/dive-into-graphql-9bfedf22e1a)
 - [Sample Project built on gqlgen with Postgres by Oleg Shalygin](https://github.com/oshalygin/gqlgen-pg-todo-example)
+- [Hackernews GraphQL Server with gqlgen by Shayegan Hooshyari](https://www.howtographql.com/graphql-go/0-introduction/)