Adds Dockerfile for containerization

Creates a Dockerfile to containerize the application using Python 3.11.

Specifies base image, sets environment variables, defines working directory, copies dependencies, installs them using pip, copies the source code, exposes port 5000, and defines the command to run the application.

Dockerfile

@@ -0,0 +1,15 @@
+FROM python:3.11-slim
+
+ENV PYTHONDONTWRITEBYTECODE=1
+ENV PYTHONUNBUFFERED=1
+
+WORKDIR /app
+
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY . .
+
+EXPOSE 5000
+
+CMD ["python", "app.py"]