nginx-utils: Added readme

[mrajagopal]

Proposed changes

This PR addresses issue 195 providing a brief description of instructions on usage and building.

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING guide
• I have proven my fix is effective or that my feature works
• I have checked that all unit tests pass after adding my changes
• I have ensured the README is up to date
• I have rebased my branch onto main
• I will ensure my PR is targeting the main branch and pulling from my branch on my own fork

[Copilot]

Pull Request Overview

This PR adds comprehensive documentation for the nginx-utils package by creating a new README.md file and updating the main project README to reference it. The documentation provides usage instructions for the nginx-utils debugging container and build instructions.

• Added a complete README.md for the nginx-utils package with usage examples and build instructions
• Updated the main project README to reference the nginx-utils documentation
• Documented the api_stats.sh script usage with practical examples

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
nginx-utils/README.md	New comprehensive documentation for nginx-utils package including usage, examples, and build instructions
README.md	Added reference link to nginx-utils documentation

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}