Add project files.

Packer3D.cs

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+/*
+ * PÔVODNÝ ALGORITMUS – zakomentovaný, nahradený LayerPacker
+ *
+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace BoxPacker3D
+{
+    public class Packer3D
+    {
+        private const double EPS = 0.001;
+
+        public List<PackedItem> Pack(List<Item> items, Box box,
+            double wallPad = 0, double itemPad = 0, Action<int, int>? onProgress = null,
+            bool allowRotation = true, bool preferRotated = false)
+        {
+            // ... (Extreme Points algorithm)
+        }
+        // ... helper methods
+    }
+}
+*/