Creating custom providers 

<?php

namespace MyVendor\MyExtension\Provider;

use Netresearch\NrLlm\Provider\AbstractProvider;
use Netresearch\NrLlm\Provider\Contract\ProviderInterface;

class MyCustomProvider extends AbstractProvider implements ProviderInterface
{
    protected string $baseUrl = 'https://api.example.com/v1';

    public function getName(): string
    {
        return 'My Custom Provider';
    }

    public function getIdentifier(): string
    {
        return 'custom';
    }

    public function isConfigured(): bool
    {
        return !empty($this->apiKey);
    }

    public function chatCompletion(array $messages, array $options = []): CompletionResponse
    {
        $payload = $this->buildChatPayload($messages, $options);
        $response = $this->sendRequest('chat', $payload);

        return new CompletionResponse(
            content: $response['choices'][0]['message']['content'],
            model: $response['model'],
            usage: $this->parseUsage($response['usage']),
            finishReason: $response['choices'][0]['finish_reason'],
            provider: $this->getIdentifier(),
        );
    }

    // Implement other required methods...
}