update project and selectors

core/internal/app/app.go

@@ -0,0 +1,16 @@
+package app
+
+import (
+	"gopher-toolbox/app"
+)
+
+type ExtendedApp struct {
+	app.App
+}
+
+func NewExtendedApp(appName, version, envDirectory string) *ExtendedApp {
+	app := app.New(appName, version, envDirectory)
+	return &ExtendedApp{
+		App: *app,
+	}
+}