Add project files.

ConstructorApp.EntityLayer/Entities/CompanyInfoVideo.cs

@@ -0,0 +1,12 @@
+using System.ComponentModel.DataAnnotations;
+
+namespace ConstructorApp.EntityLayer.Entities
+{
+    public class CompanyInfoVideo
+    {
+        public int CompanyInfoVideoID { get; set; }
+        [StringLength(500)]
+        [Required]
+        public string? VideoUrl { get; set; } // Tanıtım videosu için URL (YouTube, mp4 vs.)
+    }
+}