first commit

DTOs/ClientInvoice/ClientInvoiceItemDto.cs

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+namespace Fitness_core_BE.DTOs.ClientInvoice
+{
+    public class ClientInvoiceItemDto
+    {
+        public Guid ClientInvoiceItemId { get; set; }
+        public string? ItemName { get; set; }
+        public string? ItemDescription { get; set; }
+        public decimal ItemPrice { get; set; }
+        public DateTime CreatedAt { get; set; }
+    }
+}