Add Cursor Marketplace tab for Temporal Developer Skill (#4432)

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: starfleeth

docs/with-ai.mdx

@@ -37,6 +37,16 @@ error handling, testing strategies, worker configuration, versioning, and common
    /plugin install temporal-developer@temporal-marketplace
    ```
 
+</TabItem>
+<TabItem value="cursor" label="Cursor">
+
+Install the Temporal plugin from the [Cursor Marketplace](https://cursor.com/marketplace/temporal), or run the following
+command in Cursor's agent chat:
+
+```
+/add-plugin temporal-developer
+```
+
 </TabItem>
 <TabItem value="npx" label="npx">