Add Flask app, requirements, and Dockerfile

Dockerfile

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+# Use an official Python base image
+FROM python:3.9-slim
+
+# Create a working directory
+WORKDIR /code
+
+# Copy requirements and install dependencies
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Copy the rest of the app
+COPY . .
+
+# Expose the port expected by Hugging Face Spaces
+EXPOSE 7860
+
+# Run your Flask app
+CMD ["python", "app.py"]
+