feat: add new stages for creating topics in CreateTopics API

Introduce multiple new stages for the CreateTopics API, focusing on various scenarios such as creating topics with valid, invalid, reserved, and existing names, as well as validation-only mode and batch creation. This update enhances the documentation and provides clear guidelines for implementing the CreateTopics functionality.

Author: ryan-gang

course-definition.yml

@@ -80,6 +80,15 @@ extensions:
 
       [produce-api]: https://kafka.apache.org/protocol.html#The_Messages_Produce
 
+  - slug: "creating-topics"
+    name: "Creating Topics"
+    description_markdown: |
+      In this challenge extension you'll add support for creating topics by implementing the [CreateTopics][create-topics-api] API.
+
+      Along the way you'll learn about how Kafka's CreateTopics API works, topic validation, the `__cluster_metadata` topic and more.
+
+      [create-topics-api]: https://kafka.apache.org/protocol.html#The_Messages_CreateTopics
+
 stages:
   - slug: "vi6"
     name: "Bind to a port"
@@ -259,4 +268,54 @@ stages:
     difficulty: hard
     marketing_md: |-
       In this stage, you'll implement producing to multiple topics in a single request.
-      Stages:
+
+  # Creating Topics
+
+  - slug: "yb1"
+    primary_extension_slug: "creating-topics"
+    name: "Include CreateTopics in APIVersions"
+    difficulty: easy
+    marketing_md: |-
+      In this stage, you'll add the CreateTopics API to the APIVersions response.
+
+  - slug: "ve7"
+    primary_extension_slug: "creating-topics"
+    name: "CreateTopics with Invalid Topic Name"
+    difficulty: medium
+    marketing_md: |-
+      In this stage, you'll implement the CreateTopics response for invalid topic names.
+
+  - slug: "cb8"
+    primary_extension_slug: "creating-topics"
+    name: "CreateTopics with Reserved Topic Name"
+    difficulty: medium
+    marketing_md: |-
+      In this stage, you'll implement the CreateTopics response for reserved topic names.
+
+  - slug: "us2"
+    primary_extension_slug: "creating-topics"
+    name: "CreateTopics with Existing Topic Name"
+    difficulty: medium
+    marketing_md: |-
+      In this stage, you'll implement the CreateTopics response for existing topic names.
+
+  - slug: "hh9"
+    primary_extension_slug: "creating-topics"
+    name: "CreateTopics with Validation Only"
+    difficulty: medium
+    marketing_md: |-
+      In this stage, you'll implement the CreateTopics response for validation-only mode.
+
+  - slug: "rk2"
+    primary_extension_slug: "creating-topics"
+    name: "CreateTopics with a single topic"
+    difficulty: hard
+    marketing_md: |-
+      In this stage, you'll implement creating a single topic.
+
+  - slug: "fl3"
+    primary_extension_slug: "creating-topics"
+    name: "CreateTopics with Multiple Topics"
+    difficulty: hard
+    marketing_md: |-
+      In this stage, you'll implement creating multiple topics in a single request.