Initial commit: RSS feed viewer with Docker setup

Dockerfile

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+FROM python:3.12-slim
+
+# Prevent Python from writing .pyc files and enable unbuffered logs.
+ENV PYTHONDONTWRITEBYTECODE=1
+ENV PYTHONUNBUFFERED=1
+
+WORKDIR /app
+
+# Install dependencies first for better layer caching.
+COPY requirements.txt ./
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY . .
+
+EXPOSE 5000
+
+# Keep testing and local dev via `flask` if desired; docker runs the app directly.
+CMD ["python", "app.py"]