Add devcontainer

.devcontainer/Dockerfile

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+# Poetry doesn't yet support Python 3.10
+FROM python:3.9.7
+
+# Environment variables
+ENV PYTHONFAULTHANDLER=1 \
+  PYTHONUNBUFFERED=1 \
+  PIP_DEFAULT_TIMEOUT=100 \
+  POETRY_VIRTUALENVS_CREATE=false \
+  PATH="~/.local/bin:$PATH"
+
+# Copy all project files
+COPY . .
+
+# Install poetry and dependencies
+RUN curl -sSL https://raw.githubusercontent.com/python-poetry/poetry/master/install-poetry.py | python - && ~/.local/bin/poetry install --no-ansi --no-interaction
+
+# Install pre-commit
+RUN pre-commit

.devcontainer/devcontainer.json

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+// For format details, see https://aka.ms/devcontainer.json. For config options, see the README at:
+// https://github.com/microsoft/vscode-dev-containers/tree/v0.205.1/containers/python-3
+{
+	"name": "WTPython",
+	"build": {
+		"dockerfile": "Dockerfile",
+		"context": ".." // Set the workdir to be the parent directory of devcontainer.json
+	},
+	"settings": {
+		"python.defaultInterpreterPath": "/usr/local/bin/python",
+		"python.linting.enabled": true,
+	},
+
+	// Add the IDs of extensions you want installed when the container is created.
+	"extensions": [
+		"ms-python.vscode-pylance",
+		"ms-python.python",
+		"github.vscode-pull-request-github",
+		"github.copilot",
+		"eamodio.gitlens"
+	],
+	// Features that vscode will install on build
+	"features": {
+		"git": "latest"
+	}
+}