C# member documentatino prompt

[aaronpowell]

No description provided.

[github-actions]

⚠️ README.md needs to be updated

The update-readme.js script detected changes that need to be made to the README.md file.

Please run node update-readme.js locally and commit the changes before merging this PR.

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diff --git a/README.md b/README.md
index 3b7ac47..d36058c 100644
--- a/README.md
+++ b/README.md
@@ -64,6 +64,9 @@ Ready-to-use prompt templates for specific development scenarios and tasks, defi
### FinOps
- [Azure Cost Optimize](prompts/az-cost-optimize.prompt.md) - Analyze Azure resources used in the app (IaC files and/or resources in a target rg) and optimize costs - creating GitHub issues for identified optimizations.

+### Uncategorised
+- [C# Documentation Best Practices](prompts/csharp-docs.prompt.md) - Ensure that C# types are documented with XML comments and follow best practices for documentation.
+


> 💡 **Usage**: Use `/prompt-name` in VS Code chat, run `Chat: Run Prompt` command, or hit the run button while you have a prompt open.

[Copilot]

Pull Request Overview

Adds a new prompt file defining XML documentation best practices for C# members.

• Introduces prompts/csharp-docs.prompt.md outlining use of <summary>, <param>, <returns>, and other XML tags.
• Provides nested guidance for <inheritdoc/> behavior.

[Copilot]

Remove the duplicate word 'the' so it reads 'usage examples on how to use the member.'

Suggested change

	- Use `<example>` for usage examples on how to use the the member.
	- Use `<example>` for usage examples on how to use the member.