Added a dev container for PS

dev-containers/powershell-container/.vscode/devContainer.json

@@ -0,0 +1,6 @@
+{
+	"dockerFile": "dev-container.dockerfile",
+	"extensions": [
+		"ms-vscode.powershell"
+	]
+}

dev-containers/powershell-container/dev-container.dockerfile

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+FROM microsoft/powershell
+
+# Install required tools
+RUN apt-get update \
+	&& apt-get install -y git \
+	&& rm -rf /var/lib/apt/lists/*

dev-containers/powershell-container/test.ps1

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+param([int]$Count=50, [int]$DelayMilliseconds=200)
+
+function Write-Item($itemCount) {
+    $i = 1
+
+    while ($i -le $itemCount) {
+        $str = "Output $i"
+        Write-Output $str
+
+        # In the gutter on the left, right click and select "Add Conditional Breakpoint"
+        # on the next line. Use the condition: $i -eq 25
+        $i = $i + 1
+
+        # Slow down execution a bit so user can test the "Pause debugger" feature.
+        Start-Sleep -Milliseconds $DelayMilliseconds
+    }
+}
+
+# Do-Work will be underlined in green if you haven't disable script analysis.
+# Hover over the function name below to see the PSScriptAnalyzer warning that "Do-Work"
+# doesn't use an approved verb.
+function Do-Work($workCount) {
+    Write-Output "Doing work..."
+    Write-Item $workcount
+    Write-Host "Done!"
+}
+
+Do-Work $Count