Add initial project structure for Telegram bot

- Created Docker configuration files for development and production.
- Added Dockerfile for building the bot image.
- Implemented configuration loading from environment variables.
- Developed main application logic and command handlers.
- Included README with setup instructions and usage details.
- Added .gitignore and .dockerignore files to exclude unnecessary files.
- Provided example environment file (.env.example) for bot token configuration.
- Established basic error handling for the bot.

handlers/errors.py

@@ -0,0 +1,13 @@
+"""Global error handler: log exception and notify user."""
+import logging
+
+from telegram import Update
+from telegram.ext import ContextTypes
+
+logger = logging.getLogger(__name__)
+
+
+async def error_handler(update: object, context: ContextTypes.DEFAULT_TYPE) -> None:
+    logger.exception("Exception while handling an update")
+    if isinstance(update, Update) and update.effective_message:
+        await update.effective_message.reply_text("Something went wrong. Please try again later.")