Create Add-Exclusion.ps1 for Windows Defender

Add-Exclusion.ps1

@@ -0,0 +1,15 @@
+Start-Process -Verb RunAs -Wait powershell.exe -Args @"
+  `$dir=\`"${pwd}\`"
+  Write-Output \`"Adding exclusion path to Windows Defender: `${dir}\`"
+  Add-MpPreference -ExclusionPath \`"`${dir}\`"
+  `$result = if (`$?)
+  {
+    \`"Command succeeded\`"
+  }
+  else
+  {
+    \`"Command failed\`"
+  }
+  Write-Output `$result
+  read-host \`"Press enter to exit\`"
+"@

README.md

@@ -29,6 +29,7 @@ Windows:
 - Install [ninja](https://github.com/ninja-build/ninja/releases) and add it to `%PATH%`.
 - Install [Python](https://www.python.org/downloads/) and add it to `%PATH%`.
   - Also available from the [Windows Store](https://apps.microsoft.com/store/detail/python-311/9NRWMJP3717K).
+- (Optional) Run `Add-Exclusion.ps1` (Right click -> "Run with PowerShell") to avoid degraded performance from Windows Defender scans.
 
 macOS:
 ------