docs: Create comprehensive README with project documentation

[devin-ai-integration]

docs: Create comprehensive README with project documentation

Summary

This PR rewrites the README.md to provide comprehensive project documentation. The new README includes a proper structure with sections for technology stack, prerequisites, installation instructions, project structure, API documentation, testing, and deployment guides.

Key additions:

• Technology stack table with versions
• Prerequisites and installation instructions
• Project structure tree diagram
• Application routes documentation
• API endpoints documentation
• Testing and deployment instructions
• Proper markdown formatting with tables

Review & Testing Checklist for Human

• Verify the prerequisites (Node.js 12.x, npm 6.x, Angular CLI 9.x) are accurate for this project
• Confirm the API endpoint https://node-hnapi.herokuapp.com is still active and correct
• Check that the README renders correctly on GitHub (tables, code blocks, images)

Notes

This is a documentation-only change with no code modifications. The content was derived from examining the actual codebase (package.json, angular.json, source files).

Link to Devin run: https://app.devin.ai/sessions/8043579ff72f4d6781b610fa8c12ccdc
Requested by: Joao Esteves (@joao-cognition)

[devin-ai-integration]

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