Add project files.

StockDal.Interface/IStockRepository.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 IStockRepository
+    {
+        IEnumerable<StockMember> GetAllRemainingStocks();
+        IEnumerable<StockMember> GetAllStocks();
+        void InsertMany(List<StockMember> stockMembers);
+        void RemoveAllStocks();
+        void RestoreStockMembers(List<StockMember> stockMembers);
+        void SaveStockMember(StockMember stockMember);
+        void UpdateActualForSell(int id, int sellAmount, decimal sellPrice, DateTime sellDate);
+        void UpdateActualPrice(int id, decimal price);
+    }
+}