add dev container

.devcontainer/devcontainer.json

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+{
+    "name": "Django Time Tracker",
+    "dockerFile": "Dockerfile",
+    "customizations": {
+      "vscode": {
+        "settings": {
+          "python.pythonPath": "/usr/local/bin/python",
+          "python.defaultInterpreterPath": "/usr/local/bin/python",
+          "terminal.integrated.defaultProfile.linux": "bash"
+        },
+        "extensions": [
+          "ms-python.python",
+          "ms-python.vscode-pylance",
+          "ms-azuretools.vscode-docker"
+        ]
+      }
+    },
+    "forwardPorts": [8000],
+    "postCreateCommand": "poetry install && poetry run python manage.py migrate",
+    "remoteUser": "vscode"
+  }

devcontainer.Dockerfile

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+FROM python:3.13-slim
+
+# Set up environment
+ENV PYTHONUNBUFFERED=1
+WORKDIR /workspace
+
+# Install Poetry
+RUN apt-get update && apt-get install -y curl \
+    && rm -rf /var/lib/apt/lists/*
+RUN curl -sSL https://install.python-poetry.org | python3 -
+ENV PATH="/root/.local/bin:$PATH"
+
+# Copy pyproject.toml and poetry.lock for dependency installation
+COPY pyproject.toml poetry.lock* ./
+RUN poetry install --no-root
+
+# Copy the rest of the application code
+COPY . .
+
+# Set up Django development server
+EXPOSE 8000