Add some debug info

Author: Suiram1701

WebUntisAPI.Client/Exceptions/WebUntisException.cs

@@ -1,6 +1,7 @@
 using Newtonsoft.Json;
 using System;
 using System.Collections.Generic;
+using System.Diagnostics;
 using System.Linq;
 using System.Runtime.Serialization;
 using System.Text;
@@ -11,6 +12,7 @@ namespace WebUntisAPI.Client.Exceptions
     /// <summary>
     /// An error that the WebUntis server returned
     /// </summary>
+    [DebuggerDisplay("Message = {Message}, Code = {Code}")]
     public class WebUntisException : Exception
     {
         /// <summary>

WebUntisAPI.Client/Models/School.cs

@@ -1,6 +1,7 @@
 using Newtonsoft.Json;
 using System;
 using System.Collections.Generic;
+using System.Diagnostics;
 using System.Linq;
 using System.Runtime.Serialization;
 using System.Text;
@@ -11,6 +12,7 @@ namespace WebUntisAPI.Client.Models
     /// <summary>
     /// Represent a Untis school
     /// </summary>
+    [DebuggerDisplay("Name = {DisplayName}, Id = {SchoolId}")]
     public struct School
     {
         /// <summary>

WebUntisAPI.Client/Models/Student.cs

@@ -1,6 +1,7 @@
 using Newtonsoft.Json;
 using System;
 using System.Collections.Generic;
+using System.Diagnostics;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
@@ -10,6 +11,7 @@ namespace WebUntisAPI.Client.Models
     /// <summary>
     /// A student
     /// </summary>
+    [DebuggerDisplay("Name = {ForeName} {LongName}")]
     public sealed class Student : IUser
     {
         /// <inheritdoc/>