Add reference to grizzly starter

Closes gh-17620

spring-boot-project/spring-boot-starters/README.adoc

@@ -85,6 +85,9 @@ do as they were designed before this was clarified.
 | https://graphql.org/[GraphQL] and https://github.com/graphql/graphiql[GraphiQL] with https://github.com/graphql-java/[GraphQL Java]
 | https://github.com/graphql-java/graphql-spring-boot
 
+| https://javaee.github.io/grizzly/[Grizzly]
+| https://github.com/dabla/grizzly-spring-boot-starter
+
 | https://www.grpc.io/[gRPC]
 | https://github.com/LogNet/grpc-spring-boot-starter