Adds Powershell scripts to tools.

tools/powershell/Stop-Server.ps1

@@ -0,0 +1,25 @@
+#!/usr/bin/env pwsh
+
+# Set strict mode for better error handling
+Set-StrictMode -Version Latest
+$ErrorActionPreference = "Stop"
+
+# Check required environment variables
+if (-not $env:MINECRAFT_SERVER_PATH -or -not $env:MINECRAFT_SERVER_JAR) {
+    Write-Error "Error: MINECRAFT_SERVER_PATH and MINECRAFT_SERVER_JAR must be set."
+    exit 1
+}
+
+# Find running server process (java with the server jar)
+$ServerProcess = Get-Process -Name "java" -ErrorAction SilentlyContinue | Where-Object { 
+    $_.CommandLine -like "*$($env:MINECRAFT_SERVER_JAR)*" 
+}
+
+if ($ServerProcess) {
+    Write-Host "Minecraft server is running (PID: $($ServerProcess.Id)). Stopping it..."
+    Stop-Process -Id $ServerProcess.Id -Force
+    Start-Sleep -Seconds 5
+    Write-Host "Minecraft server stopped."
+} else {
+    Write-Host "Minecraft server is not running."
+}