Bring back Codespaces

Author: bergmeister

.devcontainer/Dockerfile

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+# Copyright (c) Microsoft Corporation. All rights reserved.
+# Licensed under the MIT License.
+
+FROM mcr.microsoft.com/dotnet/sdk:8.0
+    
+RUN pwsh --command Install-Module platyPS,Pester -Force

.devcontainer/devcontainer.json

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+// For format details, see https://aka.ms/vscode-remote/devcontainer.json
+{
+    "name": "C# (.NET 8.0)",
+    "dockerFile": "Dockerfile",
+    "customizations": {
+        "vscode": {
+            "settings": {
+                "terminal.integrated.defaultProfile.linux": "pwsh"
+            },
+            "extensions": [
+                "ms-dotnettools.csharp",
+                "ms-vscode.powershell"
+            ]
+        }
+    }
+}