Add project files.

GreadyPoang.DataLayer/DataClasses/ParticipantRepository.cs

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+using Common.Library;
+using GreadyPoang.EntityLayer;
+using System.Collections.ObjectModel;
+
+namespace GreadyPoang.DataLayer;
+
+public class ParticipantRepository : IRepository<Participant>
+{
+
+    private ObservableCollection<Participant> lager;
+
+    public ParticipantRepository()
+    {
+        if (lager == null || lager.Count == 0)
+        {
+            lager = new ObservableCollection<Participant>();
+
+            lager.Add(new Participant
+            {
+                ParticipantId = 1,
+                FirstName = @"Kalle",
+                LastName = @"Persson",
+                Email = @"kalle@person.com",
+            });
+            lager.Add(new Participant
+            {
+                ParticipantId = 2,
+                FirstName = @"Olle",
+                LastName = @"Goop",
+                Email = @"olle@goop.com",
+            });
+            lager.Add(new Participant
+            {
+                ParticipantId = 3,
+                FirstName = @"Nisse",
+                LastName = @"Pärlemo",
+                Email = @"nisse@parlemo.com"
+            });
+        }
+    }
+
+    #region Get Method
+    public ObservableCollection<Participant> Get()
+    {
+        // This method should return a collection of Participant objects.
+        // For now, returning an empty collection.
+        return lager;
+    }
+
+    public Participant? Get(int id)
+    {
+        return Get().Where(row => row.ParticipantId == id).FirstOrDefault();
+    }
+    #endregion
+
+    public bool Save(Participant entity)
+    {
+        if (entity.ParticipantId == 0)
+        {
+            // New entity
+            var maxId = lager.Max(p => p.ParticipantId);
+            entity.ParticipantId = maxId + 1;
+            lager.Add(entity);
+        }
+        else
+        {
+            // Existing entity
+            var existing = Get(entity.ParticipantId);
+            if (existing != null)
+            {
+                existing.FirstName = entity.FirstName;
+                existing.LastName = entity.LastName;
+                existing.Email = entity.Email;
+            }
+            else
+            {
+                return false; // Entity not found
+            }
+        }
+
+        return true;
+    }
+}