added docker file

Attendence/Dockerfile

+# Use an official Python runtime as a parent image
+FROM python:3.8.10
+
+# Set the working directory in the container
+WORKDIR /opt/attendance
+
+# Copy the current directory contents into the container at /usr/src/app
+COPY . .
+
+# Install any needed packages specified in requirements.txt
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Make port 80 available to the world outside this container
+EXPOSE 5003
+
+# Run app.py when the container launches
+CMD ["python", "./attendence.py"]