Backend login and register

src/Domain/Entities/UserRole.cs

@@ -0,0 +1,10 @@
+namespace Domain.Entities;
+
+public class UserRole
+{
+    public int UserId { get; set; }
+    public User? User { get; set; }
+
+    public int RoleId { get; set; }
+    public Role? Role { get; set; }
+}