Update README.md

README.md

@@ -22,6 +22,7 @@ Explore and compare the performance of the fastest GraphQL frameworks through ou
 [Apollo GraphQL]: https://new.apollographql.com/
 [Netflix DGS]: https://netflix.github.io/dgs/
 [Caliban]: https://ghostdogpr.github.io/caliban/
+[async-graphql]: https://github.com/async-graphql/async-graphql
 
 ## Introduction