add project first skeleton

internal/app/app.go

@@ -0,0 +1,6 @@
+package app
+
+
+type App struct {
+	// Application state and configurations can be added here
+}

internal/app/errors.go

@@ -0,0 +1,9 @@
+package app
+
+import (
+	"errors"
+)
+
+var (
+	ErrNilPointerWarn = errors.New("nil pointer dereference warning")
+)