add Dockerfile and instructions

Dockerfile

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+ARG PYTHON_VERSION=3.11
+
+FROM python:${PYTHON_VERSION} AS builder
+
+WORKDIR /app
+
+COPY requirements.txt .
+
+RUN pip install --user -r requirements.txt
+
+COPY . .
+
+FROM python:${PYTHON_VERSION}-slim
+
+WORKDIR /app
+
+COPY --from=builder /root/.local /root/.local
+
+COPY --from=builder /app .
+
+ENV PATH=/root/.local/bin:$PATH
+ENV PYTHONUNBUFFERED=1
+
+RUN python manage.py migrate
+
+CMD ["python", "manage.py", "runserver", "0.0.0.0:8080"]

INSTRUCTION.md

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+ToDo App Docker Instructions
+
+1. Docker Hub Repository
+The pre-built image is available at the following link:
+https://hub.docker.com/r/trickykot3/todoapp
+
+2. Build Instructions
+Build for local use:
+
+docker build -t todoapp .
+
+Build for pushing to Docker Hub:
+
+docker build -t trickykot3/todoapp:1.0.0 .
+
+3. Run Instructions
+Run the local image:
+
+docker run -p 8080:8080 --name my_todo_app todoapp
+
+Run the image from Docker Hub:
+
+docker run -p 8080:8080 --name my_todo_app trickykot3/todoapp:1.0.0
+
+(Note: The todoapp and trickykot3/todoapp:1.0.0 tags refer to the same build; the only difference is the naming convention for local testing vs. registry deployment.)
+
+4. Accessing the Application
+Once the container is up and running, you can access the application via your web browser at:
+http://localhost:8080