feat: improvements in structures

domain/entity/user.go

@@ -0,0 +1,17 @@
+package entity
+
+import (
+	"time"
+)
+
+//User data
+type User struct {
+	ID        ID
+	Email     string
+	Password  string
+	FirstName string
+	LastName  string
+	CreatedAt time.Time
+	UpdatedAt time.Time
+	Books     []ID
+}