Cookbook article on using Chat to create diagrams (#56907)

Co-authored-by: Jules Porter <jules-p@users.noreply.github.com>
Co-authored-by: Ben Ahmady <32935794+subatoi@users.noreply.github.com>

content/copilot/tutorials/copilot-chat-cookbook/communicate-effectively/creating-diagrams.md

@@ -0,0 +1,64 @@
+---
+title: Creating diagrams
+shortTitle: Create diagrams
+intro: GitHub Copilot Chat can help you create diagrams to better understand your data and communicate insights.
+versions:
+  feature: copilot
+complexity:
+  - Simple
+octicon: copilot
+topics:
+  - Copilot
+contentType: tutorials
+---
+
+{% data variables.copilot.copilot_chat %} can help you create mermaid diagrams to visualize data, making it easier to understand and communicate insights. You can ask {% data variables.copilot.copilot_chat_short %} to generate diagrams based on your data or code, and it will provide you with the necessary code to create those diagrams.
+
+## Example scenario
+
+You want to create a Gantt chart to visualize the timeline of a project. You can ask {% data variables.copilot.copilot_chat_short %} to generate the mermaid code for the Gantt chart, with specific details about the project phases and their durations. You can then use this code in any Markdown file that supports mermaid syntax, such as issues, discussions, or pull requests on {% data variables.product.github %}.
+
+## Example prompt
+
+`Create a mermaid gantt diagram that covers the period August 1st 2025 until January 31st, 2025. Include 5 phases, each taking 6 weeks, and overlapping equally.`
+
+## Example response
+
+{% data reusables.copilot.example-prompts.response-is-an-example %}
+
+{% data variables.product.prodname_copilot_short %} will provide you with the mermaid code to create the flowchart. You can copy the code {% data variables.copilot.copilot_chat_short %} provides and paste it anywhere on {% data variables.product.github %} that supports Markdown, such as an issue or discussion.
+
+Ensure you include the correct mermaid syntax of `` ```mermaid `` before and `` ``` `` after the code block to render the diagram correctly.
+
+````text
+```mermaid
+gantt
+    title Project Timeline: Aug 2025 - Jan 2026
+    dateFormat  YYYY-MM-DD
+    axisFormat  %b %d
+
+    section Phase 1
+    Phase 1           :a1, 2025-08-01, 42d
+
+    section Phase 2
+    Phase 2           :a2, 2025-09-07, 42d
+
+    section Phase 3
+    Phase 3           :a3, 2025-10-13, 42d
+
+    section Phase 4
+    Phase 4           :a4, 2025-11-18, 42d
+
+    section Phase 5
+    Phase 5           :a5, 2025-12-24, 42d
+```
+````
+
+This Mermaid code would generate the following diagram:
+
+![Screenshot of a rendered Mermaid gantt chart.](/assets/images/help/copilot/mermaid-gantt-chart-example.png)
+
+## Further reading
+
+* [Mermaid documentation](https://mermaid-js.github.io/mermaid/#/)
+* [GitHub Copilot Chat documentation](/copilot/how-tos/use-chat)

content/copilot/tutorials/copilot-chat-cookbook/communicate-effectively/index.md

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+---
+title: Communicate effectively
+intro: 'Discover ways that you can use {% data variables.product.prodname_copilot %} to communicate effectively with your team and stakeholders.'
+versions:
+  feature: copilot
+topics:
+  - Copilot
+children:
+  - /creating-diagrams
+contentType: tutorials
+---

content/copilot/tutorials/copilot-chat-cookbook/index.md

@@ -21,6 +21,7 @@ spotlight:
   - article: /debug-errors/debug-invalid-json
     image: /assets/images/copilot-landing/debugging_invalid_json.png
 children:
+  - /communicate-effectively
   - /debug-errors
   - /analyze-functionality
   - /refactor-code