Add Dockerfile with multi-stage build and INSTRUCTION.md

Dockerfile

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+# ─── Build Stage ───────────────────────────────────────────────────────────────
+ARG PYTHON_VERSION=3.11
+
+FROM python:${PYTHON_VERSION}-slim AS builder
+
+WORKDIR /app
+
+# Install dependencies into a separate location for clean copying
+COPY requirements.txt .
+RUN pip install --upgrade pip && \
+    pip install --no-cache-dir --prefix=/install -r requirements.txt
+
+
+# ─── Run Stage ─────────────────────────────────────────────────────────────────
+ARG PYTHON_VERSION=3.11
+
+FROM python:${PYTHON_VERSION}-slim
+
+ENV PYTHONUNBUFFERED=1
+
+WORKDIR /app
+
+# Copy installed packages from builder
+COPY --from=builder /install /usr/local
+
+# Copy project source code
+COPY . .
+
+# Run database migrations
+RUN python manage.py migrate
+
+EXPOSE 8080
+
+CMD ["python", "manage.py", "runserver", "0.0.0.0:8080"]

INSTRUCTION.md

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+# ToDo App — Docker Instructions
+
+## Docker Hub Repository
+
+Image is available at:
+**https://hub.docker.com/r/vadymmoldovan/todoapp**
+
+---
+
+## 1. Build the Docker Image
+
+Clone the repository and build the image:
+
+```bash
+git clone https://github.com/VadymMoldovan/devops_todolist.git
+cd devops_todolist
+
+docker build -t todoapp:1.0.0 .
+```
+
+To build with a custom Python version (optional):
+
+```bash
+docker build --build-arg PYTHON_VERSION=3.11 -t todoapp:1.0.0 .
+```
+
+---
+
+## 2. Run the Container
+
+```bash
+docker run -d -p 8080:8080 --name todoapp todoapp:1.0.0
+```
+
+| Flag | Description |
+|------|-------------|
+| `-d` | Run in detached (background) mode |
+| `-p 8080:8080` | Map port 8080 of the container to port 8080 on your machine |
+| `--name todoapp` | Name the running container |
+
+---
+
+## 3. Access the Application in a Browser
+
+Open your browser and navigate to:
+
+```
+http://localhost:8080
+```
+
+---
+
+## 4. Pull the Image from Docker Hub (alternative)
+
+Instead of building locally, you can pull the pre-built image:
+
+```bash
+docker pull vadymmoldovan/todoapp:1.0.0
+docker run -d -p 8080:8080 --name todoapp vadymmoldovan/todoapp:1.0.0
+```
+
+---
+
+## 5. Push Image to Docker Hub (for maintainers)
+
+```bash
+docker tag todoapp:1.0.0 vadymmoldovan/todoapp:1.0.0
+docker push vadymmoldovan/todoapp:1.0.0
+```
+
+---
+
+## 6. Stop and Remove the Container
+
+```bash
+docker stop todoapp
+docker rm todoapp
+```