Add project files.

Gready_Poang.ViewModelLayer/ViewModelClasses/MethodSharingService.cs

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+using Common.Library;
+using GreadyPoang.EntityLayer;
+using System.Collections.ObjectModel;
+
+namespace GreadyPoang.ViewModelLayer;
+
+public class MethodSharingService : ViewModelBase, IMethodSharingService<Participant>
+{
+    private readonly IRepository<Participant> _repository;
+
+    public MethodSharingService(IRepository<Participant> repository)
+    {
+        _repository = repository;
+    }
+
+
+    public ObservableCollection<Participant> Get()
+    {
+        ObservableCollection<Participant> _participantList = new();
+
+        if (_repository != null)
+        {
+            var participantsTask = _repository.Get();
+            var participants = participantsTask is Task<IEnumerable<Participant>> task
+                ? task.GetAwaiter().GetResult()
+                : (IEnumerable<Participant>)participantsTask;
+            foreach (var participant in participants)
+            {
+                if (!_participantList.Any(p => p.ParticipantId == participant.ParticipantId))
+                {
+                    _participantList.Add(participant);
+                }
+            }
+        }
+        return _participantList;
+    }
+}