Add project files.

ConstructorApp.BusinessLayer/Concrete/SliderManager.cs

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+using ConstructorApp.BusinessLayer.Abstract;
+using ConstructorApp.DataAccessLayer.Abstract;
+using ConstructorApp.EntityLayer.Entities;
+
+namespace ConstructorApp.BusinessLayer.Concrete
+{
+    public class SliderManager : ISliderService
+    {
+        private readonly ISliderDal _sliderDal;
+
+        public SliderManager(ISliderDal sliderDal)
+        {
+            _sliderDal = sliderDal;
+        }
+
+        public void TAdd(Slider entity)
+        {
+            _sliderDal.Add(entity); 
+        }
+
+        public void TDelete(Slider entity)
+        {
+            _sliderDal.Delete(entity);
+        }
+
+        public Slider TGetByID(int id)
+        {
+           return _sliderDal.GetByID(id);
+        }
+
+        public List<Slider> TGetListAll()
+        {
+           return _sliderDal.GetListAll();
+        }
+
+        public void TUpdate(Slider entity)
+        {
+            _sliderDal.Update(entity);
+        }
+    }
+}