Add GitHub Pages install script for Windows

- Create docs/windows file to serve as GitHub Pages endpoint
- This script downloads and executes the actual installer from server-files/install.ps1
- Fixes the 'irm https://litiantian123-code.github.io/agbcloud-cli/windows' command
- Users can now install AgbCloud CLI using the one-liner command

Author: litiantian257

docs/windows

@@ -0,0 +1,37 @@
+# PowerShell script to download and install AgbCloud CLI
+# This script downloads the actual installer from the repository
+
+$ErrorActionPreference = "Stop"
+
+Write-Host "AgbCloud CLI Windows Installer" -ForegroundColor Green
+Write-Host "==============================" -ForegroundColor Green
+Write-Host ""
+
+# Download the actual install script from the repository
+$installScriptUrl = "https://raw.githubusercontent.com/litiantian123-code/agbcloud-cli/main/server-files/install.ps1"
+$tempPath = "$env:TEMP\agbcloud-install.ps1"
+
+try {
+    Write-Host "[INFO] Downloading installer script..." -ForegroundColor Yellow
+    Invoke-WebRequest -Uri $installScriptUrl -OutFile $tempPath -UseBasicParsing
+    
+    Write-Host "[INFO] Running installer..." -ForegroundColor Yellow
+    Write-Host ""
+    
+    # Execute the downloaded script
+    & PowerShell -ExecutionPolicy Bypass -File $tempPath
+    
+    # Clean up
+    Remove-Item $tempPath -ErrorAction SilentlyContinue
+    
+} catch {
+    Write-Error "Failed to download or execute installer: $_"
+    Write-Host ""
+    Write-Host "Manual installation options:" -ForegroundColor Yellow
+    Write-Host "1. Download install.ps1 directly from:" -ForegroundColor White
+    Write-Host "   https://raw.githubusercontent.com/litiantian123-code/agbcloud-cli/main/server-files/install.ps1" -ForegroundColor Cyan
+    Write-Host ""
+    Write-Host "2. Or visit the releases page:" -ForegroundColor White
+    Write-Host "   https://github.com/litiantian123-code/agbcloud-cli/releases" -ForegroundColor Cyan
+    exit 1
+}