Add project files.

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);
+}