Add project files.

ConstructorApp.EntityLayer/Entities/Service.cs

@@ -0,0 +1,18 @@
+using System.ComponentModel.DataAnnotations;
+
+namespace ConstructorApp.EntityLayer.Entities
+{
+    public class Service
+    {
+        [Key]
+        public int ServiceID { get; set; }
+        [StringLength(100)]
+        [Required]
+        public string? Title { get; set; } // Architecture
+        [StringLength(100)]
+        [Required]
+        public string? SubTitle { get; set; } // We provide high-quality architecture services.
+        [StringLength(100)]
+        public bool IsActive { get; set; } //0=Pasif 1=Aktif
+    }
+}