Add project files.

Common.Library/BaseClasses/CommonBase.cs

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+using System.ComponentModel;
+
+namespace Common.Library;
+
+public abstract class CommonBase : INotifyPropertyChanged
+{
+    #region Constructor
+    protected CommonBase()
+    {
+        Init();
+    }
+    #endregion
+
+    #region Init Method
+    public virtual void Init()
+    {
+
+    }
+    #endregion
+
+
+    #region RaisePropertyChanged Method
+    public event PropertyChangedEventHandler? PropertyChanged;
+    public virtual void RaisePropertyChanged(string propertyName)
+    {
+        this.PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
+    }
+    #endregion
+}

Common.Library/BaseClasses/EntityBase.cs

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+namespace Common.Library;
+
+public class EntityBase : CommonBase
+{
+}

Common.Library/BaseClasses/ViewModelBase.cs

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+//using GreadyPoang.DataLayer;
+
+namespace Common.Library;
+public class ViewModelBase : CommonBase
+{
+    //private readonly LocalDbService _dbService;
+
+    //public ViewModelBase(LocalDbService dbService)
+    //{
+    //    _dbService = dbService;
+    //}
+
+}
+

Common.Library/Common.Library.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+	  <TargetFrameworks>
+		  net9.0-android;
+		  net9.0-ios;
+		  net9.0-maccatalyst;
+		  net9.0-windows10.0.19041
+	  </TargetFrameworks>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+
+</Project>

Common.Library/Interfaces/IMethodSharingService.cs

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+using System.Collections.ObjectModel;
+
+namespace Common.Library
+{
+    public interface IMethodSharingService<TEntity>
+    {
+        ObservableCollection<TEntity> Get();
+    }
+}

Common.Library/Interfaces/IRepository.cs

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+namespace Common.Library;
+
+public interface IRepository<TEntity>
+{
+    Task<IEnumerable<TEntity>> Get();
+    Task<TEntity?> Get(int id);
+    Task<int> Save(TEntity entity);
+    bool Delete(TEntity entity);
+    Task<bool> DeleteById(int Id);
+}