Add project files.

StockDal.Interface/IBackupRepository.cs

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+using DataDomain;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace StockDAL.Interface
+{
+    public interface IBackupRepository
+    {
+        IEnumerable<BackupRegister> GetAllBackupRegisters();
+        BackupRegister GetBackupRegisterById(int brId);
+        BackupRegister SaveBackupReging(BackupRegister backupRegister);
+    }
+}