Add project files

T120B165-ImgBoard/Dtos/SlimUserDto.cs

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+using T120B165_ImgBoard.Models;
+
+namespace T120B165_ImgBoard.Dtos;
+
+public record SlimUserDto(string UserId, string UserName)
+{
+    public static SlimUserDto FromUser(User user)
+    {
+        return new SlimUserDto(user.Id, user.UserName);
+    }
+};