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/__init__.py

@@ -0,0 +1,10 @@
+"""Expose a single register_handlers(app) that registers all handlers."""
+from telegram.ext import Application
+
+from . import commands, errors
+
+
+def register_handlers(app: Application) -> None:
+    app.add_handler(commands.start_handler)
+    app.add_handler(commands.help_handler)
+    app.add_error_handler(errors.error_handler)