Add authentication and authorization (#21)

Reviewed-on: #21

src/GameIdeas/GameIdeas.Shared/Dto/UserDto.cs

@@ -7,5 +7,5 @@ public class UserDto
     public int? Id { get; set; }
     public string? Username { get; set; }
     public string? Password { get; set; }
-    public Role? Role { get; set; }
+    public string? RoleId { get; set; }
 }