feat: add initial stage description for CreateTopics API implementation

Introduce the first stage description for the CreateTopics API, detailing the inclusion of the API in the APIVersions response. This stage outlines the necessary tests and notes for implementation, setting the groundwork for subsequent stages.

Author: ryan-gang

stage_descriptions/create-topics-01_yb1.md

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+In this stage, you'll add an entry for the `CreateTopics` API to the APIVersions response.
+
+### APIVersions
+
+Your Kafka implementation should include the CreateTopics API (key=19) in the ApiVersions response before implementing topic creation functionality. This lets the client know that the broker supports the CreateTopics API.
+
+### Tests
+
+The tester will execute your program like this:
+
+```bash
+./your_program.sh
+```
+
+It'll then connect to your server on port 9092 and send a valid `APIVersions` (v4) request.
+
+The tester will validate that:
+
+- The first 4 bytes of your response (the "message length") are valid.
+- The correlation ID in the response header matches the correlation ID in the request header.
+- The error code in the response body is `0` (No Error).
+- The response body contains at least one entry for the API key `19` (CreateTopics).
+- The `MaxVersion` for the CreateTopics API is at least 7.
+
+### Notes
+
+- You don't have to implement support for the `CreateTopics` request in this stage. We'll get to this in later stages.
+- You'll still need to include the entry for `APIVersions` in your response to pass the previous stage.