Add project files.

ConstructorApp.BusinessLayer/Concrete/ContactUsManager.cs

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+using ConstructorApp.BusinessLayer.Abstract;
+using ConstructorApp.DataAccessLayer.Abstract;
+using ConstructorApp.EntityLayer.Entities;
+
+namespace ConstructorApp.BusinessLayer.Concrete
+{
+    public class ContactUsManager : IContactUsService
+    {
+        private readonly IContactUsDal _contactUsDal;
+
+        public ContactUsManager(IContactUsDal contactUsDal)
+        {
+            _contactUsDal = contactUsDal;
+        }
+
+        public void TAdd(ContactUs entity)
+        {
+            _contactUsDal.Add(entity);
+        }
+
+        public int TCountAll()
+        {
+            return _contactUsDal.CountAll();
+        }
+
+        public int TCountByStatusPending()
+        {
+            return _contactUsDal.CountByStatusPending();
+        }
+
+        public void TDelete(ContactUs entity)
+        {
+            _contactUsDal.Delete(entity);
+        }
+
+        public ContactUs TGetByID(int id)
+        {
+            return _contactUsDal.GetByID(id);
+        }
+
+        public List<ContactUs> TGetListAll()
+        {
+           return _contactUsDal.GetListAll();
+        }
+
+        public void TMarkAsRead(int id)
+        {
+            _contactUsDal.MarkAsRead(id);
+        }
+
+        public void TUpdate(ContactUs entity)
+        {
+           _contactUsDal.Update(entity);
+        }
+    }
+}