(GH-176) Add the Meetings.GetRegistrantAsync method

Source/ZoomNet/Resources/IMeetings.cs

@@ -250,6 +250,17 @@ public interface IMeetings
 		/// </returns>
 		Task<RegistrantInfo> AddRegistrantAsync(long meetingId, string email, string firstName, string lastName, string address = null, string city = null, Country? country = null, string postalCode = null, string stateOrProvince = null, string phoneNumber = null, string industry = null, string organization = null, string jobTitle = null, string timeFrame = null, RoleInPurchaseProcess? role = null, NumberOfEmployees? employees = null, string comments = null, IEnumerable<RegistrationAnswer> questionAnswers = null, Language? language = null, bool autoApprove = false, string occurrenceId = null, CancellationToken cancellationToken = default);
 
+		/// <summary>
+		/// Retrieve a meeting registrant.
+		/// </summary>
+		/// <param name="meetingId">The meeting ID.</param>
+		/// <param name="registrantId">The registrant unique identifier.</param>
+		/// <param name="cancellationToken">The cancellation token.</param>
+		/// <returns>
+		/// The <see cref="Registrant"/>.
+		/// </returns>
+		Task<Registrant> GetRegistrantAsync(long meetingId, string registrantId, CancellationToken cancellationToken = default);
+
 		/// <summary>
 		/// Approve a registration for a meeting.
 		/// </summary>