Cannot add google account (It is not in the list of available account)
Manufacturers must certify their devices with Google in order to have the Google Apps pre-installed1. Obviously that wasn't done for your device. So you have to either install GApps manually (follow the previous link for details) – or use the chance a "Google free" device gives you and install an open source alternative like miroG.



1: See e.g. here; the term for this agreement is MADA (Mobile Application Distribution Agreement)