Domain driven over MVC
If your project has multiple binaries, it’s a good idea to have a cmd/ subdirectory to hold them.
If your project is large and has significant of non-Go code, like UI assets or sophisticated build tooling, it might be a good idea to keep your Go code isolated in pkg/ subdirectory.
If you’re going to have multiple packages, it’s probably a good idea to orient them around the business domain, rather than around accidents of implementation.
That is: package user, yes; package models, no.