Add project files.

GreadyPoang.EntityLayer/EntityClasses/Participant.cs

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+using Common.Library;
+
+namespace GreadyPoang.EntityLayer;
+
+public class Participant : EntityBase
+{
+    public Participant()
+    {
+        _firstName = string.Empty;
+        _lastName = string.Empty;
+        _email = string.Empty;
+    }
+
+    private int _participantId;
+    private string _firstName;
+    private string _lastName;
+    private string _email;
+
+    public int ParticipantId
+    {
+        get { return _participantId; }
+        set
+        {
+            _participantId = value;
+            RaisePropertyChanged(nameof(ParticipantId));
+        }
+    }
+
+    public string FirstName
+    {
+        get { return _firstName; }
+        set
+        {
+            _firstName = value;
+            RaisePropertyChanged(nameof(FirstName));
+        }
+    }
+
+    public string LastName
+    {
+        get { return _lastName; }
+        set
+        {
+            _lastName = value;
+            RaisePropertyChanged(nameof(LastName));
+        }
+    }
+    public string Email
+    {
+        get { return _email; }
+        set
+        {
+            _email = value;
+            RaisePropertyChanged(nameof(Email));
+        }
+    }
+
+    public string FullName
+    {
+        get { return $"{FirstName} {LastName}"; }
+    }
+
+    public string LastNameFirstName
+    {
+        get { return $"{LastName}, {FirstName}"; }
+    }
+}

GreadyPoang.EntityLayer/GreadyPoang.EntityLayer.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net9.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\Common.Library\Common.Library.csproj" />
+  </ItemGroup>
+
+</Project>