Add ToolsRoot so Chocolatey_Bin_Root is \tools

ToolsRoot/tools/chocolateyInstall.ps1

@@ -0,0 +1,22 @@
+$packageName = 'ToolsRoot'
+
+try
+{
+  $variableName = 'Chocolatey_Bin_Root'
+  if (!(Get-Item Env:$variableName -ErrorAction SilentlyContinue))
+  {
+    $path = '\tools'
+    [Environment]::SetEnvironmentVariable($variableName, $path, 'User')
+    Set-Item Env:$variableName $path
+
+    $binRoot = Join-Path $Env:SystemDrive $path
+    Write-Host "Configured $variableName as $binRoot"
+  }
+
+  Write-ChocolateySuccess $package
+}
+catch
+{
+  Write-ChocolateyFailure $package "$($_.Exception.Message)"
+  throw
+}