Add architecture documentation (zephyr_architecture_Diagram.md)

[Nithinnithu0610]

This PR adds a new Markdown file under doc/architecture/ that documents the Zephyr technical architecture.

• Provides high-level system overview
• Helps contributors and users understand the project structure
• Complements existing developer documentation

[github-actions]

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[Nithinnithu0610]

Hello Maintainers,

I have added a new architecture documentation file (doc/architecture/zephyr_architecture_Diagram.md) as part of my contribution.
This document provides a high-level overview of Zephyr’s architecture for easier understanding and future reference.

Kindly review this PR and let me know if any improvements or changes are required.

Thank you for your time and guidance! 🙏

— Nithin H (GitHub: @Nithinnithu0610)

[pdgendt]

I don't think this should live alongside the existing documentation. Also feels 🤖-generated...

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[kartben]

@Nithinnithu0610 thanks for the contribution. Given we use neither mermaid (but might one day) nor Markdown we can't really accept this PR.

I don't necessarily mind you using an LLM to look at ways to improve our docs but I would suggest your work towards incrementally improving our existing doc pages.

I'll probably close this PR in a few days unless you want to update it with changes more align with our current doc style and doc infrastructure. Thank you!