Add devcontainer

devcontainer.json

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+{
+  "name": "HA Thermia Water Heater Integration",
+  "image": "mcr.microsoft.com/devcontainers/python:1-3.12",
+  "postCreateCommand": "./scripts/setup.sh",
+  "remoteUser": "vscode",
+  "customizations": {
+    "vscode": {
+      "settings": {
+        "python.pythonPath": "/usr/local/bin/python"
+      },
+      "extensions": [
+        "GitHub.copilot",
+        "github.vscode-pull-request-github",
+        "ms-python.python",
+        "ms-python.vscode-pylance"
+      ]
+    }
+  }
+}

requirements.txt

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+homeassistant==2024.4.1
+ThermiaOnlineAPI==5.0.0

scripts/setup.sh

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+#!/usr/bin/env bash
+
+set -e
+
+cd "$(dirname "$0")/.."
+
+# Install dependencies
+
+install_packages() {
+  python -m pip \
+    install \
+    --upgrade \
+    --disable-pip-version-check \
+    "${@}"
+}
+
+install_packages "pip<23.2,>=21.3.1"
+install_packages setuptools wheel
+install_packages -r requirements.txt