ADDED: Docker functionality: docker-compose.yml, docker-entrypoint, Dockerfile

Added: Env example: .env.example
Changed: More functionality for Docker: requirements.txt

Dockerfile

@@ -0,0 +1,60 @@
+# Use Python 3.11 slim image for smaller size
+FROM python:3.11-slim
+
+# Set maintainer
+LABEL maintainer="your-email@example.com"
+LABEL description="PY_ChatBot - Modern Flask-based Chatbot Application"
+
+# Set environment variables
+ENV PYTHONDONTWRITEBYTECODE=1 \
+    PYTHONUNBUFFERED=1 \
+    FLASK_APP=main.py \
+    FLASK_ENV=production \
+    PIP_NO_CACHE_DIR=1 \
+    PIP_DISABLE_PIP_VERSION_CHECK=1
+
+# Set work directory
+WORKDIR /app
+
+# Install system dependencies
+RUN apt-get update && apt-get install -y \
+    gcc \
+    sqlite3 \
+    && rm -rf /var/lib/apt/lists/*
+
+# Create non-root user for security
+RUN addgroup --system --gid 1001 chatbot && \
+    adduser --system --uid 1001 --gid 1001 --no-create-home --disabled-password chatbot
+
+# Copy requirements first for better Docker layer caching
+COPY requirements.txt .
+
+# Install Python dependencies
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Copy application code
+COPY . .
+
+# Create necessary directories and set permissions
+RUN mkdir -p /app/databases /app/logs /app/static && \
+    chown -R chatbot:chatbot /app
+
+# Copy entrypoint script
+COPY docker-entrypoint.sh /usr/local/bin/
+RUN chmod +x /usr/local/bin/docker-entrypoint.sh
+
+# Switch to non-root user
+USER chatbot
+
+# Expose port
+EXPOSE 8080
+
+# Health check
+HEALTHCHECK --interval=30s --timeout=10s --start-period=30s --retries=3 \
+    CMD curl -f http://localhost:8080/ || exit 1
+
+# Set entrypoint
+ENTRYPOINT ["docker-entrypoint.sh"]
+
+# Default command
+CMD ["python", "main.py"]