added console application

Memory.Logic/Game.cs

@@ -0,0 +1,67 @@
+namespace Memory.Logic
+{
+    public class Game
+    {
+        public const int DECKSIZE = 10;
+        public const int GRIDSIZE = 5;
+        public List<Card> Cards { get; } = CreateDeck(DECKSIZE);
+
+        private static List<Card> CreateDeck(int pairs)
+        {
+            List<Card> cards = [];
+            for (int i = 1; i < pairs + 1; i++)
+            {
+                cards.Add(new(i));
+                cards.Add(new(i));
+            }
+            Random random = new();
+            return [..cards.OrderBy(card => random.Next())];
+        }
+
+        public Card? GetChoice1()
+        {
+            return Cards.FirstOrDefault(card => card.IsChoice1);
+        }
+
+        public Card? GetChoice2()
+        {
+            return Cards.FirstOrDefault(card => card.IsChoice2);
+        }
+
+        public bool IsFinished()
+        {
+            return Cards.All(card => card.Completed);
+        }
+
+        public void ClickCard(Card card)
+        {
+            Card? choice1 = GetChoice1();
+            Card? choice2 = GetChoice2();
+            if (!card.Completed)
+            {
+                if ((choice1 == null && choice2 == null) || (choice1 != null && choice2 != null))
+                {
+                    if (choice1 != null)
+                    {
+                        choice1.IsChoice1 = false;
+                    }
+                    if (choice2 != null)
+                    {
+                        choice2.IsChoice2 = false;
+                    }
+                    card.IsChoice1 = true;
+                }
+                else if (choice1 != null && choice2 == null && choice1 != card)
+                {
+                    card.IsChoice2 = true;
+                    if (choice1.Matches(card))
+                    {
+                        choice1.Completed = true;
+                        card.Completed = true;
+                        // handle score etc
+                    }
+                }
+            }
+        }
+    }
+}