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.

Dockerfile

@@ -0,0 +1,18 @@
+# Single image for both dev and prod; Compose files differentiate behavior.
+FROM python:3.12-slim
+
+WORKDIR /app
+
+# Install dependencies
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Application code
+COPY config.py main.py ./
+COPY handlers/ ./handlers/
+
+# Run as non-root
+RUN adduser --disabled-password --gecos "" botuser && chown -R botuser:botuser /app
+USER botuser
+
+CMD ["python", "main.py"]