added console application

Memory.Logic/Card.cs

@@ -0,0 +1,20 @@
+namespace Memory.Logic
+{
+    public class Card(int id)
+    {
+        public int ID { get; } = id;
+        public bool IsChoice1 { get; set; } = false;
+        public bool IsChoice2 { get; set; } = false;
+        public bool Completed { get; set; } = false;
+
+        public bool Matches(Card card)
+        {
+            return ID == card.ID;
+        }
+
+        public bool Selected()
+        {
+            return IsChoice1 || IsChoice2;
+        }
+    }
+}

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
+                    }
+                }
+            }
+        }
+    }
+}

Memory.Logic/Memory.Logic.csproj

@@ -0,0 +1,9 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>