docs(readme): update badges in README

[Pouyanpi]

[github-actions]

Documentation preview

https://nvidia-nemo.github.io/Guardrails/review/pr-1535

[greptile-apps]

Greptile Overview

Greptile Summary

Updated README badges from static placeholders to dynamic shields.io badges that automatically pull real-time data from PyPI and GitHub Actions workflows.

Key Changes:

• Replaced static test badge with dynamic GitHub Actions workflow status badges for Linux (pr-tests.yml), Windows, and macOS (both use full-tests.yml)
• Updated PyPI and Python version badges to pull live data from PyPI registry
• Added new badges: Lint workflow status, Documentation link, and download statistics (total and monthly)
• Improved badge styling and organization with better visual consistency

Assessment:
All badge URLs are correctly configured and point to valid workflow files and external resources. The changes enhance the README by providing real-time project status visibility.

Confidence Score: 5/5

• This PR is safe to merge with no risk - it only updates README badge markdown with no code changes
• Documentation-only change that replaces static badges with dynamic ones. All workflow file references have been verified to exist and are correctly configured. No functional code changes, no dependencies affected, and no potential runtime impact.
• No files require special attention

Important Files Changed

File Analysis

Filename	Score	Overview
README.md	4/5	Updated badges from static placeholders to dynamic shields.io badges that pull real-time status from PyPI and GitHub Actions

Sequence Diagram

sequenceDiagram
    participant Dev as Developer
    participant GH as GitHub Repository
    participant Shields as shields.io
    participant PyPI as PyPI Registry
    participant Actions as GitHub Actions
    participant User as README Viewer

    Dev->>GH: Push badge updates to README.md
    User->>GH: View README.md
    GH->>User: Return README with badge markdown
    
    par Fetch Badge Data
        User->>Shields: Request PyPI version badge
        Shields->>PyPI: Query package version
        PyPI-->>Shields: Return version data
        Shields-->>User: Render version badge
        
        User->>Shields: Request Python version badge
        Shields->>PyPI: Query supported versions
        PyPI-->>Shields: Return version data
        Shields-->>User: Render Python version badge
        
        User->>Shields: Request workflow status badges
        Shields->>Actions: Query workflow status
        Actions-->>Shields: Return build status
        Shields-->>User: Render status badges
        
        User->>Shields: Request download badges
        Shields->>PyPI: Query download stats
        PyPI-->>Shields: Return download counts
        Shields-->>User: Render download badges
    end

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