docs: add GitHub Pages repository README

scripts/deploy-pages.ps1

@@ -6,6 +6,7 @@ $ErrorActionPreference = 'Stop'
 
 $projectRoot = Split-Path -Parent $PSScriptRoot
 $siteSource = Join-Path $projectRoot 'pages-dist'
+$readmeSource = Join-Path $projectRoot 'pages/README.md'
 $workflowSource = Join-Path $projectRoot 'pages/deploy.yml'
 $temporaryRoot = Join-Path ([System.IO.Path]::GetTempPath()) ("holodori-pages-{0}" -f [guid]::NewGuid().ToString('N'))
 $checkout = Join-Path $temporaryRoot 'repository'
@@ -28,13 +29,14 @@ try {
   if (Test-Path -LiteralPath $oldSiteTarget) {
     Remove-Item -LiteralPath $oldSiteTarget -Recurse -Force
   }
-  foreach ($generatedPath in @('assets', 'icons', 'index.html', 'README.txt', 'VERSION.txt', '.nojekyll')) {
+  foreach ($generatedPath in @('assets', 'icons', 'index.html', 'README.md', 'README.txt', 'VERSION.txt', '.nojekyll')) {
     $target = Join-Path $resolvedCheckout $generatedPath
     if (Test-Path -LiteralPath $target) {
       Remove-Item -LiteralPath $target -Recurse -Force
     }
   }
   Copy-Item -Path (Join-Path $siteSource '*') -Destination $resolvedCheckout -Recurse -Force
+  Copy-Item -LiteralPath $readmeSource -Destination (Join-Path $resolvedCheckout 'README.md') -Force
   New-Item -ItemType File -Path (Join-Path $resolvedCheckout '.nojekyll') -Force | Out-Null
 
   $workflowTarget = Join-Path $resolvedCheckout '.github/workflows'