Adding minimal version of property selector, using reflection

Experiments/ExternalActionManager/DemoBot/Forms/HiddenLetterForm.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using TelegramBotBase.Base;
+using TelegramBotBase.Form;
+
+namespace DemoBot.Forms
+{
+    public class HiddenLetterForm : AutoCleanForm
+    {
+
+        public Guid letterId {  get; set; }
+
+        public HiddenLetterForm()
+        {
+
+            DeleteMode = TelegramBotBase.Enums.EDeleteMode.OnLeavingForm;
+            DeleteSide = TelegramBotBase.Enums.EDeleteSide.Both;
+        }
+
+        public override async Task Action(MessageResult message)
+        {
+            if (message.RawData != "start")
+            {
+                return;
+            }
+
+
+            await message.ConfirmAction("Lets go");
+
+            message.Handled = true;
+
+            var st = new StartForm();
+
+            await NavigateTo(st);
+        }
+
+        public override async Task Render(MessageResult message)
+        {
+
+            var bf = new ButtonForm();
+
+            bf.AddButtonRow("Goto Start", "start");
+
+            await Device.Send($"Welcome to Hidden letter form\n\nYour letter Id is: {letterId}", bf);
+
+
+        }
+
+    }
+}