Feature Request: Add support for 'accounts' and 'contacts' to the PHP SDK

Hello B2BRouter team,

First of all, thank you for providing the PHP SDK (b2brouter-php). It is very helpful for our integration!

I noticed that currently, the SDK supports the invoices, taxReportSettings, and taxReports entities. We are currently working on expanding our integration and it would be incredibly useful for us if the SDK could also include support for the accounts and contacts endpoints.

Are there any plans to add these entities to the PHP SDK in the near future?

Thank you for your time and great work!

Best regards,
Antonio Peleteiro