Add docs for creating a topic

plugins/ca-kafka-local/README.md

@@ -51,3 +51,13 @@ Please don't start Kafka within your projects `process-compose.yaml` file. For e
 We don't want to set up circular loops where Hotel launches `devbox services up` and then this launches Hotel again.
 
 For now run Hotel commands in a separate terminal. In future we might provide helpers in Hotel that launch services in your project as well as projects you depend on.
+
+## Creating a topic
+
+You can use one of the CLI tools to create topics your service requires.
+
+For example:
+
+    kafkactl create topic local.mytopic.v1
+
+In future we plan to support creating your topics as defined in [kafka-ops](https://github.com/cultureamp/kafka-ops/).