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/commands.py

@@ -0,0 +1,21 @@
+"""Command handlers: /start, /help (and placeholder for more)."""
+from telegram import Update
+from telegram.ext import CommandHandler, ContextTypes
+
+
+async def start(update: Update, context: ContextTypes.DEFAULT_TYPE) -> None:
+    if update.message:
+        await update.message.reply_text("Hello! I'm your bot. Use /help to see available commands.")
+
+
+async def help_cmd(update: Update, context: ContextTypes.DEFAULT_TYPE) -> None:
+    if update.message:
+        await update.message.reply_text(
+            "Available commands:\n"
+            "/start - Start the bot\n"
+            "/help - Show this help"
+        )
+
+
+start_handler = CommandHandler("start", start)
+help_handler = CommandHandler("help", help_cmd)