README: improve project architecture documentation

[parthib2006]

Is your feature request related to a problem? Please describe.

The README project architecture is hard to read; commands and folder/file structure aren’t clearly distinguished.

Describe the solution you'd like

• Wrap command examples in bash code blocks
• Minor formatting improvements for clarity

Describe alternatives you've considered

No alternatives; documentation improvement is sufficient.

Additional context
Documentation-only change; no code is affected.

[github-actions]

Thank you for raising this issue!

We'll review it as soon as possible. We truly appreciate your contributions! ✨

Meanwhile make sure you've visited the README.md, CONTRIBUTING.md, and CODE_OF_CONDUCT.md before creating a PR for this. Also, please do NOT create a PR until this issue has been assigned to you. 😊