add devcontainer

.devcontainer/Dockerfile

@@ -0,0 +1,6 @@
+ARG VARIANT="3.10-bullseye"
+FROM mcr.microsoft.com/vscode/devcontainers/python:0-${VARIANT}
+
+RUN apt-get update && apt-get install -y clang-format-11
+
+RUN pip3 --disable-pip-version-check --no-cache-dir install platformio

.devcontainer/devcontainer.json

@@ -0,0 +1,32 @@
+{
+  "name": "Python 3",
+  "build": {
+    "dockerfile": "Dockerfile",
+    "context": "..",
+    "args": {
+      "VARIANT": "3.10-bullseye"
+    }
+  },
+  "settings": {
+    "python.defaultInterpreterPath": "/usr/local/bin/python",
+    "python.linting.enabled": true,
+    "python.linting.pylintEnabled": true,
+    "python.formatting.autopep8Path": "/usr/local/py-utils/bin/autopep8",
+    "python.formatting.blackPath": "/usr/local/py-utils/bin/black",
+    "python.formatting.yapfPath": "/usr/local/py-utils/bin/yapf",
+    "python.linting.banditPath": "/usr/local/py-utils/bin/bandit",
+    "python.linting.flake8Path": "/usr/local/py-utils/bin/flake8",
+    "python.linting.mypyPath": "/usr/local/py-utils/bin/mypy",
+    "python.linting.pycodestylePath": "/usr/local/py-utils/bin/pycodestyle",
+    "python.linting.pydocstylePath": "/usr/local/py-utils/bin/pydocstyle",
+    "python.linting.pylintPath": "/usr/local/py-utils/bin/pylint",
+    "clang-format.executable": "clang-format-11"
+  },
+  "extensions": [
+    "ms-python.python",
+    "ms-python.vscode-pylance",
+    "platformio.platformio-ide",
+    "xaver.clang-format"
+  ],
+  "postCreateCommand": "pip3 install --user platformio"
+}