Blocking a country to access my E-commerce Website using Bigcommerce Software

I would like to block my website from certain country to access by website. So all of the content is blocked from people from that specific country to see. I am having an ecommerce website that uses Bigcommerce Software. But I would like to consult you whether there is anyway that we could do that. I would like to block an entire country to access the site. And I will need just a few IP address that is in the specific country to be able to access it. Anyone of you can is a 100% that you can handle and accomplish this task. Please bid on the project.