Update codespaces.yml

.github/DISCUSSION_TEMPLATE/codespaces.yml

@@ -1,5 +1,9 @@
 labels: [Codespaces]
 body:
+- type: markdown
+  attributes: 
+   value: Create a discussion about Codespaces here. For all other topics, please check out our [Quick Start Guide.](https://github.com/orgs/community/discussions/141947)
+
 - type: dropdown
   id: topic
   attributes: