first commit

DTOs/Attendance/AttendanceCountDTO.cs

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+namespace Fitness_core_BE.DTOs.Attendance
+{
+    public class AttendanceCountDTO
+    {
+        public Guid CustomerId { get; set; }
+        public string? CustomerName { get; set; }
+        public int AttendanceCount { get; set; }
+    }
+}