Add a quickstart for the default REST Client

Let's make it consistent with the RESTEasy Client

devtools/project-core-extension-codestarts/src/main/resources/codestarts/quarkus/extension-codestarts/rest-client-codestart/base/README.tpl.qute.md

@@ -0,0 +1 @@
+{#include readme-header /}

devtools/project-core-extension-codestarts/src/main/resources/codestarts/quarkus/extension-codestarts/rest-client-codestart/codestart.yml

@@ -0,0 +1,13 @@
+name: rest-client-codestart
+ref: rest-client
+type: code
+tags: extension-codestart
+metadata:
+  title: REST Client
+  description: Invoke different services through REST with JSON
+  related-guide-section: https://quarkus.io/guides/rest-client
+language:
+  base:
+    dependencies:
+      - io.quarkus:quarkus-rest-client
+      - io.quarkus:quarkus-rest-client-jackson

devtools/project-core-extension-codestarts/src/main/resources/codestarts/quarkus/extension-codestarts/rest-client-codestart/java/src/main/java/org/acme/MyRemoteService.java

@@ -0,0 +1,37 @@
+package org.acme;
+
+import org.eclipse.microprofile.rest.client.inject.RegisterRestClient;
+
+import jakarta.ws.rs.GET;
+import jakarta.ws.rs.Path;
+import jakarta.ws.rs.QueryParam;
+import java.util.List;
+import java.util.Set;
+
+/**
+ * To use it via injection.
+ *
+ * {@code
+ *     @Inject
+ *     @RestClient
+ *     MyRemoteService myRemoteService;
+ *
+ *     public void doSomething() {
+ *         Set<MyRemoteService.Extension> restClientExtensions = myRemoteService.getExtensionsById("io.quarkus:quarkus-hibernate-validator");
+ *     }
+ * }
+ */
+@RegisterRestClient(baseUri = "https://stage.code.quarkus.io/api")
+public interface MyRemoteService {
+
+    @GET
+    @Path("/extensions")
+    Set<Extension> getExtensionsById(@QueryParam("id") String id);
+
+    class Extension {
+        public String id;
+        public String name;
+        public String shortName;
+        public List<String> keywords;
+    }
+}

devtools/project-core-extension-codestarts/src/main/resources/codestarts/quarkus/extension-codestarts/rest-client-codestart/kotlin/src/main/kotlin/org/acme/MyRemoteService.kt

@@ -0,0 +1,29 @@
+package org.acme
+
+import org.eclipse.microprofile.rest.client.inject.RegisterRestClient
+import jakarta.ws.rs.GET
+import jakarta.ws.rs.Path
+import jakarta.ws.rs.QueryParam
+
+/**
+ * To use it via injection.
+ *
+ * ```kotlin
+ *     @Inject
+ *     @RestClient
+ *     lateinit var myRemoteService: MyRemoteService
+ *
+ *     fun doSomething() {
+ *         val restClientExtensions = myRemoteService.getExtensionsById("io.quarkus:quarkus-rest-client")
+ *     }
+ * ```
+ */
+@RegisterRestClient(baseUri = "https://stage.code.quarkus.io/api")
+interface MyRemoteService {
+
+    @GET
+    @Path("/extensions")
+    fun getExtensionsById(@QueryParam("id") id: String): Set<Extension>
+
+    data class Extension(val id: String, val name: String, val shortName: String, val keywords: List<String>)
+}

extensions/resteasy-reactive/rest-client/runtime/src/main/resources/META-INF/quarkus-extension.yaml

@@ -12,12 +12,10 @@ metadata:
   status: "stable"
   guide: "https://quarkus.io/guides/rest-client"
   codestart:
-    name: "rest"
-    kind: "core"
+    name: "rest-client"
     languages:
       - "java"
       - "kotlin"
-      - "scala"
     artifact: "io.quarkus:quarkus-project-core-extension-codestarts"
   config:
   - "quarkus.rest-client-reactive."