I don't think that belongs in the os package documentation (a new programmer is unlikely to look there first for help). What you suggest would belong more in a tutorial, like the Go tour, which already has a lot of basic examples, though nothing about reading console input.

Ideally we'd add it in both places.

If this hasn't been taken yet, I should be able to do this. The line example (provided here: https://golang.org/pkg/bufio/#Scanner) is perfect for what I think you are looking for. I may adapt the example but it should be a pretty quick addition to the docs...

I don't think a new programmer should use os or bufio to do this.
fmt is much simpler.

package main

import "fmt"

func main() {
    var x, y int
    fmt.Scan(&x, &y)
    fmt.Println(x + y)
}