Add missing response object

Author: acoumb

examples/Umbraco.AuthorizedServices.TestSite/Models/ServiceResponses/InstagramProfileResponse.cs

@@ -0,0 +1,12 @@
+using System.Text.Json.Serialization;
+
+namespace Umbraco.AuthorizedServices.TestSite.Models.ServiceResponses;
+
+public class InstagramProfileResponse
+{
+    [JsonPropertyName("id")]
+    public string Id { get; set; } = string.Empty;
+
+    [JsonPropertyName("username")]
+    public string Username { get; set; } = string.Empty;
+}