Added first app template

backend/login-counter/app.Interface/Repositories/IUnitOfWork.cs

@@ -0,0 +1,11 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace app.Interface.Repositories {
+    public interface IUnitOfWork : IDisposable {
+        int SaveChanges();
+        Task<int> SaveChangesAsync();
+    }
+}