Add documentation about quarkus-smallrye-openapi ext

Author: mcruzdev

docs/modules/ROOT/pages/includes/server-getting-started.adoc

@@ -10,6 +10,16 @@ Add the following dependency to your project's `pom.xml` file:
 </dependency>
 ----
 
+By default, the generated resources are annotated with Microprofile OpenAPI annotations, add the `io.quarkus:quarkus-smallrye-openapi` dependency to your project’s `pom.xml` file:
+
+[source,xml]
+----
+<dependency>
+    <groupId>io.quarkus</groupId>
+    <artifactId>quarkus-smallrye-openapi</artifactId>
+</dependency>
+----
+
 Note that since this extension has not been yet released, you'll need a local build of the dependency.
 
 You will also need to add or update the `quarkus-maven-plugin` configuration with the following: