Add project files.

ConstructorApp.EntityLayer/Entities/ProjectGallery.cs

@@ -0,0 +1,19 @@
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace ConstructorApp.EntityLayer.Entities
+{
+    public class ProjectGallery
+    {
+        [Key]
+        public int ProjectGalleryID { get; set; }
+        [StringLength(100)]
+        public string? ImageUrl { get; set; } // Logo görsel yolu
+        // Proje Seçimi (Foreign Key)
+        [Required]
+        public int ProjectID { get; set; }
+
+        [ForeignKey("ProjectID")]
+        public virtual Project? Project { get; set; }
+    }
+}