Merge pull request #1 from David-Engel/setup

Various improvements

Author: David-Engel

src/OutlookCalendarSync/AppointmentItemCache.cs

@@ -6,7 +6,7 @@ namespace OutlookCalendarSync
 {
     class AppointmentItemCache
     {
-        private Dictionary<AppointmentItem, AppointmentItemCacheEntry> _cache = new Dictionary<AppointmentItem, AppointmentItemCacheEntry>();
+        private readonly Dictionary<AppointmentItem, AppointmentItemCacheEntry> _cache = new Dictionary<AppointmentItem, AppointmentItemCacheEntry>();
 
         public AppointmentItemCache()
         {

src/OutlookCalendarSync/AppointmentItemCacheEntry.cs

@@ -4,10 +4,10 @@ namespace OutlookCalendarSync
 {
     public class AppointmentItemCacheEntry
     {
-        private AppointmentItem _appointmentItem;
-        private bool _isSyncItem = false;
-        private string _fromAccount;
-        private string _signature;
+        private readonly AppointmentItem _appointmentItem;
+        private readonly bool _isSyncItem = false;
+        private readonly string _fromAccount;
+        private readonly string _signature;
 
         public AppointmentItemCacheEntry(AppointmentItem appointmentItem, string fromAccount)
         {