docs: add AMRIT ecosystem architecture documentation and Mermaid diagram

[charantejguniganti]

📝 Description

JIRA ID: N/A

This PR introduces docs/ARCHITECTURE.md — a high-level overview of the AMRIT ecosystem designed to help contributors understand how the system fits together before diving into any individual repository.

The document maps relationships across AMRIT UI repositories, API microservices, mobile applications, and infrastructure components using a Mermaid.js architecture diagram. For a multi-repository ecosystem like AMRIT, this kind of bird's-eye view is often the missing piece for new contributors trying to orient themselves quickly.

Changes Added:

• Added docs/ARCHITECTURE.md with full ecosystem overview
• Added Mermaid.js architecture diagram covering all major layers
• Documented UI, API, Mobile, and Infrastructure components and their relationships
• Added architecture reference link inside README.md
• Improved repository discoverability and contributor onboarding experience

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✅ Type of Change

• 📘 Documentation (updates to docs or readme)
• ✨ New feature (non-breaking change which adds functionality)

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ℹ️ Additional Information

Motivation:
The AMRIT ecosystem spans multiple repositories and interconnected services, which can be difficult for new contributors to navigate without prior context. This documentation addresses that gap by clearly surfacing repository relationships, service interactions, system layering, and the overall ecosystem structure — making onboarding faster and reducing the ramp-up friction for first-time contributors.

Testing Performed:

• Verified Mermaid.js diagram renders correctly on GitHub
• Verified markdown formatting and document structure
• Verified README reference link navigates correctly
• Checked readability and accuracy of architecture descriptions

Screenshots: Included demonstrating rendered Mermaid.js diagram, architecture document layout, and README integration.

Added a high-level architecture document and Mermaid ecosystem diagram to help contributors better understand the repository structure and service relationships across AMRIT.

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📥 Commits

Reviewing files that changed from the base of the PR and between 4f3a2f6 and d4b364a.

📒 Files selected for processing (2)

• README.md
• docs/ARCHITECTURE.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[charantejguniganti]

@drtechie
Added a high-level AMRIT ecosystem architecture document along with a Mermaid.js diagram to improve contributor onboarding and repository discoverability across the platform.

Would appreciate your review and feedback. Thanks!