wire up example by way of testing

example/caller.go

@@ -0,0 +1,16 @@
+package example
+
+import (
+	"context"
+	"fmt"
+	"os"
+)
+
+func Main() {
+	resp, err := getViewer(context.Background())
+	if err != nil {
+		fmt.Println(err)
+		os.Exit(1)
+	}
+	fmt.Println("you are:", resp.Viewer.Name)
+}