Create ShapeContainer.cs

DrawFigureLibrary/ShapeContainer.cs

@@ -0,0 +1,13 @@
+namespace DrawFigureLibrary
+{
+    public static class ShapeContainer
+    {
+        public static List<Figure> FigureList { get; } = new List<Figure>();
+
+        public static void    AddFigure(Figure fig)    => FigureList.Add(fig);
+
+        public static bool    RemoveFigure(Figure fig) => FigureList.Remove(fig);
+
+        public static Figure? FindByName(string name)  => FigureList.FirstOrDefault(f => f.Name == name);
+    }
+}