Add project files.

ConstructorApp.BusinessLayer/Concrete/FooterManager.cs

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+using ConstructorApp.BusinessLayer.Abstract;
+using ConstructorApp.DataAccessLayer.Abstract;
+using ConstructorApp.EntityLayer.Entities;
+
+namespace ConstructorApp.BusinessLayer.Concrete
+{
+    public class FooterManager : IFooterService
+    {
+        private readonly IFooterDal _footerDal;
+
+        public FooterManager(IFooterDal footerDal)
+        {
+            _footerDal = footerDal;
+        }
+
+        public void TAdd(Footer entity)
+        {
+            _footerDal.Add(entity);
+        }
+
+        public void TDelete(Footer entity)
+        {
+           _footerDal.Delete(entity);
+        }
+
+        public Footer TGetByID(int id)
+        {
+           return _footerDal.GetByID(id);
+        }
+
+        public Footer TGetFooterDetails()
+        {
+            return _footerDal.GetFooterDetails(); // Footer bilgilerini DAL'dan alır
+        }
+
+        public List<Footer> TGetListAll()
+        {
+            return _footerDal.GetListAll();
+        }
+
+        public void TUpdate(Footer entity)
+        {
+            _footerDal.Update(entity);
+        }
+    }
+}