создала ветку для 8 лабы, добавила перечисление свойств колонок и класс реализацию класса Attribute

SushiBarContracts/Attributes/ColumnAttribute.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SushiBarContracts.Attributes
+{
+    [AttributeUsage(AttributeTargets.Property)]
+    public class ColumnAttribute : Attribute
+    {
+        public ColumnAttribute(string title = "", bool visible = true, int width
+           = 0, GridViewAutoSize gridViewAutoSize = GridViewAutoSize.None, bool
+           isUseAutoSize = false)
+        {
+            Title = title;
+            Visible = visible;
+            Width = width;
+            GridViewAutoSize = gridViewAutoSize;
+            IsUseAutoSize = isUseAutoSize;
+        }
+        public string Title { get; private set; }
+        public bool Visible { get; private set; }
+        public int Width { get; private set; }
+        public GridViewAutoSize GridViewAutoSize { get; private set; }
+        public bool IsUseAutoSize { get; private set; }
+
+    }
+}

SushiBarContracts/Attributes/GridViewAutoSize.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SushiBarContracts.Attributes
+{
+    public enum GridViewAutoSize
+    {
+        NotSet = 0,
+        None = 1,
+        ColumnHeader = 2,
+        AllCellsExceptHeader = 4,
+        AllCells = 6,
+        DisplayedCellsExceptHeader = 8,
+        DisplayedCells = 10,
+        Fill = 16
+    }
+}