Updated readme for seo aeo

[ashutoshkhainar33-star]

FastPix PHP SDK - Documentation PR

Documentation Changes

What Changed

• New documentation added
• Existing documentation updated
• Documentation errors fixed
• Code examples updated
• Links and references updated
• Other

Files Modified

• README.md
• docs/ files
• USAGE.md
• CONTRIBUTING.md
• Other: _______________

Summary

Brief description of changes:

<!-- What documentation was added, updated, or fixed? -->

Code Examples (if Applicable)

<?php
// If you added/updated code examples, include them here
require_once 'vendor/autoload.php';

use FastPix\Sdk\FastpixSDK;
use FastPix\Sdk\Models\Components\Security;

$fastpix = new FastpixSDK(
    security: new Security(
        username: 'your-username',
        password: 'your-password'
    )
);

Testing

• All code examples tested
• Links verified
• Grammar checked
• Formatting consistent

Review Checklist

• Content is accurate
• Code examples work
• Links are working
• Grammar is correct
• Formatting is consistent

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Ready for review!