add one more project structure recommendation

_examples/project/main.go

@@ -0,0 +1,21 @@
+package main
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/username/project/cmd"
+)
+
+var (
+	buildRevision string
+	buildTime     string
+)
+
+func main() {
+	app := cmd.New(buildRevision, buildTime)
+	if err := app.Execute(); err != nil {
+		fmt.Println(err)
+		os.Exit(1)
+	}
+}