création CreateShowEndpoint.cs et rectification quelque chemin

PF3/Models/SoundTimecode.cs

@@ -0,0 +1,16 @@
+using System.ComponentModel.DataAnnotations;
+using Microsoft.EntityFrameworkCore;
+
+namespace PF3.Models;
+
+[PrimaryKey(nameof(ShowId), nameof(SoundId))]
+public class SoundTimecode
+{
+    [Required] public int ShowId { get; set; }
+    public Show? Show { get; set; }
+    [Required] public int SoundId { get; set; }
+    public Sound? Sound { get; set; }
+    
+    [Required] public decimal Start { get; set; }
+    [Required] public decimal End { get; set; }
+}