Allow using README.md as a default for context instead of needing copilot-instructions.md

[bbarke]

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Product Feedback

Copilot Feature Area

JetBrains & Xcode

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I'm submitting this as a follow-up to https://github.com/orgs/community/discussions/177628
I work in an environment where we have a ton of projects. A lot of them have decent README.md files. For chat/agent mode, can we have the option to default copilot to reading those README.md files? I know I can manually add the file as context for the chat session but being able to default it would give a more seamless experience.

I understand that the README.md file is for humans, and copilot-instructions are for AI - but there is often duplicate information in both. Over time, the details of each drift, even becoming contradictory, and it creates a maintenance headache and quite a bit of technical debt maintaining these two sources of truth over all our projects.

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