Add devcontainer

.devcontainer/Dockerfile

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+# See here for image contents: https://github.com/microsoft/vscode-dev-containers/tree/v0.191.1/containers/python-3/.devcontainer/base.Dockerfile
+
+# [Choice] Python version: 3, 3.9, 3.8, 3.7, 3.6
+ARG VARIANT="3.9"
+FROM mcr.microsoft.com/vscode/devcontainers/python:0-${VARIANT}
+
+# vsketch as of Aug 25, 2021
+RUN pip3 --disable-pip-version-check --no-cache-dir install https://github.com/abey79/vsketch/archive/6d4b4ea1de27ba563032ce1aee02457c16d4ea60.zip

.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/v0.191.1/containers/python-3
+{
+  "name": "Prettymaps",
+  "postStartCommand": "script/bootstrap",
+  "build": {
+    "dockerfile": "Dockerfile",
+    "context": "..",
+    "args": {
+      "VARIANT": "3.9"
+    }
+  },
+
+  "settings": {
+    "python.pythonPath": "/usr/local/bin/python",
+  },
+
+  "extensions": ["ms-python.python", "ms-python.vscode-pylance"],
+
+  "remoteUser": "vscode"
+}