Add initial setup for Dockerized application

- Added GitHub Actions workflow for building Docker images (.github/workflows/docker-image.yml)
- Created Dockerfile for containerizing the application
- Implemented main application logic in app.py
- Added requirements.txt for managing Python dependencies

Dockerfile

@@ -0,0 +1,18 @@
+# Use an official Python runtime as a parent image
+FROM python:3.9-slim
+
+# Create a working directory
+WORKDIR /app
+
+# Copy requirements and install
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Copy the application code
+COPY app.py .
+
+# Expose the port Flask will run on (5000 by default)
+EXPOSE 5000
+
+# Run the app
+CMD ["python", "app.py"]