[code-watcher] init module.

modules/CodeWatcher/CodeWatcher.cs

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+using Kruzya.TelegramBot.Core;
+
+namespace West.TelegramBot.CodeWatcher
+{
+    public class CodeWatcher : Module
+    {
+        public CodeWatcher(Core core) : base(core) {}
+    }
+}

modules/CodeWatcher/CodeWatcher.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net6.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+    <AssemblyName>TelegramBot.CodeWatcher</AssemblyName>
+    <RootNamespace>West.TelegramBot.CodeWatcher</RootNamespace>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\..\Core\Core.csproj" />
+  </ItemGroup>
+
+</Project>

modules/CodeWatcher/Handler.cs

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+using BotFramework;
+using BotFramework.Attributes;
+using BotFramework.Enums;
+using BotFramework.Utils;
+using Kruzya.TelegramBot.Core.Extensions;
+using Telegram.Bot;
+using Telegram.Bot.Types;
+using Telegram.Bot.Types.Enums;
+
+namespace West.TelegramBot.CodeWatcher;
+
+public class Handler : BotEventHandler
+{
+    private static readonly string ResponseMessage = new HtmlString()
+        .Text(", не стоит публиковать столь большой код прямо в чат. Вместо этого загрузите его на ")
+        .Url("https://pastebin.com", "https://pastebin.com")
+        .Text(" и отправьте в виде ссылки.")
+        .ToString();
+
+
+    [Message(InChat.Public, MessageFlag.HasText)]
+    public async Task HandleMessage()
+    {
+        var message = RawUpdate.Message!;
+
+        if (message.Entities == null)
+        {
+            return;
+        }
+
+        if (!await Bot.CanDeleteMessagesAsync(Chat))
+        {
+            return;
+        }
+
+        foreach (var entity in message.Entities)
+        {
+            if (entity.Type is MessageEntityType.Code or MessageEntityType.Pre)
+            {
+                var entityLines = message.Text!
+                    .Substring(entity.Offset, entity.Length)
+                    .SplitToLines()
+                    .ToList();
+
+                if (entityLines.Count >= 10)
+                {
+                    await DeleteAndNotifyAsync(message);
+                    return;
+                }
+
+                if (entityLines.Any(line => line.Length > 80))
+                {
+                    await DeleteAndNotifyAsync(message);
+                    return;
+                }
+            }
+        }
+    }
+
+    public async Task DeleteAndNotifyAsync(Message message)
+    {
+        await Bot.DeleteMessageAsync(Chat.Id, message.MessageId);
+        await Bot.SendTextMessageAsync(Chat.Id,
+            (message.From?.ToHtml() ?? "") + ResponseMessage, 
+            ParseMode.Html);
+    }
+}

modules/CodeWatcher/StringExtension.cs

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+namespace West.TelegramBot.CodeWatcher;
+
+public static class StringExtension
+{
+    // https://stackoverflow.com/a/23408020
+    public static IEnumerable<string> SplitToLines(this string input)
+    {
+        using (var reader = new StringReader(input))
+        {
+            string line;
+            while ((line = reader.ReadLine()) != null)
+            {
+                yield return line;
+            }
+        }
+    }
+}