add comments

NoteHub.cs

@@ -25,11 +25,13 @@ namespace BinaryDad.Notes
         {
             noteService.Save(content, noteName);
 
+            // find all other connections except for the current one
             var clientConnections = NoteContext.ClientNotes
                 .Where(c => c.Value == noteName && c.Key != Context.ConnectionId)
                 .Select(c => c.Key)
                 .ToList();
 
+            // update note for all other clients
             await Clients
                 .Clients(clientConnections)
                 .SendAsync("updateNote", content);